I thought of that too, but ultimately decided against it, since they took out rivalry and the approval system seems to be more or less straight forward most of the time. He also makes a point to say at the end "what we had was real" so I think that's just the writer's way of saying he wasn't just trolling you the whole entire time, or it's more complicated than that. But I guess we'll have to wait and see.
I don't really see him as racist either. I think he's at a point where he has given up on people because he's been let down so many times. He's supported so many doomed causes that failed. He's jaded and doesn't care anymore. But the Quizzy is always an exception in his eyes, if you gain his approval. I thought that was implied by the whole "the People need me" statement at the end. He remembered his purpose and cares about his plan/cause again....whatever that is.
I got the impression from DA2 (from Justice in the fade) that the opposite of pride (or purpose?) was actually sloth. And what does Solas admit he wants to do in that first convo in the fade? Run way, ignore things, etc...until the Quizzy shows up and "changed everything".
This.
I don't know how anyone who did his romance could think that he doesn't love the Inquisitor. Even if you don't romance him, he has very strong feelings regarding the Inquisitor, but it's hard to get a bead on Solas because, emotionally, he just isn't open for business most of the time. He self-isolates. He's on good terms with most of the cast, even if they don't know what to make of him, but only good terms. Nobody except Sera and Cole (and perhaps Iron Bull if they become friends) has very strong feelings about him either way. He doesn't want to have people get close to him, but he also doesn't want to put them off, so he tries very hard to be inoffensive. Now, some people may interpret that as deceitfulness, but just look at the way he interacts with the Inquisitor. If you match his rhythm, get on his wavelength for even a moment, he approves. He isn't simply approving of you agreeing with him, because those moments don't all come with agreement. He's approving of the fact that you seem to understand him, if only for a moment. And that's what he craves most of all.
As for his purpose with the Inquisition, he both wants the orb and he wants to make things right. As he says in the stinger, the mistake was his. The breach was opened, and all sorts of people and spirits were hurt, because of his actions. And he seems utterly devastated about it. He feels that he needs to see things through to the end, because in the end all of this is ultimately his responsibility. That goes for the Inquisitor, too. Really, if the Inquisitor earns Solas's respect, he sees them as the one good thing to come out of this mess. Out of anybody who could have stumbled into this power, it was someone who actually seems to be using it to make the world a better place. The Inquisitor changes everything. And part of that everything is the fact that Solas sees them actually working towards change, something that he'd almost given up on.
Conversely, if he believes the Inquisitor to be using their power (that he accidentally gave them) in order to bully people and glorify themselves, the very things that he's always been fighting against, he takes it very personally. That whole scene with his "Reason You Suck" speech has a lot of anger, but the overriding sense I got from it was disappointment. He's not just angry at the Inquisitor, he's once again angry at himself for screwing things up. So no, I don't think he's just using the Inquisition. He is very personally invested in what the Inquisition and the Inquisitor does.
I'm really not trying to interpret Solas more sympathetically than he actually is. In fact, I think he's the most broken companion in the Inquisition, even if he hides it extremely well. He woke up in a world that is basically his worst nightmare made real, and the worst part is that he helped create it. And everything he's done since then to try to change things has failed. He tried going to the Dalish, but you saw how he sometimes came across during his first conversation in Haven. Without any proof, all they saw was a crazy non-Dalish trying to tell them how to live their lives. He went to the city elves, but was faced with the fact that they had enough trouble simply making ends meet. If the Inquisitor accuses him of not doing enough for the elves, he basically throws his hands up and asks them what would they have him do? He's developed this hard shell of cynicism and self-loathing. He thinks that pretty much everyone in this new world sucks, and that he sucks most of all for making it happen.
And yet...he hasn't stopped caring for people. He's still got that bleeding heart, even under layers and layers of pain and resentment. He still feels compassion and pity when faced with the suffering of innocents. In his heart of hearts, he hasn't stopped believing that the world can be better than it is. He cares, and that's why every new disappointment hurts so much.
(Oh my god, this is long. I...uh...just watched the ending again and it gave me a lot of feels to work out)