It might be more about familiarity than supremacy, at least if you bother to befriend/romance him.
Think about it in a RL sense that's much less extreme. If you were in a foreign country where the language, culture, and people were very different from you, and came across a bar full of people from your home country, you'd probably gravitate toward them. It's not that you think your people are inherently superior; you just prefer what's familiar.
Though to bring it back to Solas, he definitely is racist against humans and qunari, dismissive of the modern dwarves, and varies between pitying the modern elves and despairing that they aren't his people. So...class act in that department 
To be honest, I think it's a bit more complicated than that. He said it verbatim to Quizzy - that he woke up in a world that blocked most people's conscious connection to the Fade. He's like a tetrachromat in the world of colourblind: he sees colors and wonders people have have no awareness or even capacity to understand. I'm not surprised that they're "like Tranquil" to him and why he feels the world is so alien.
Kinda makes me think "his people" may not exactly mean what we think he may mean. Let's not forget his slip-up right after Halamshiral, when he tells non-elf Quizzy who says that they're glad that "his people" should be better now on with "How are mages going to be treated better?"
Then there's the fact that, aside from Abelas (who's a mentor to young Sentinels), he calls both approved elf Quizzy AND spirit of wisdom 'lethallan'- neither are ancient elves, yet he recognizes them as kin.
Therefore I don't think Solas is straightforwardly racist, or confused about what elves are 'his people': the difference between "his people" may lie mostly in the mindset, rather than specific bloodline or provenience.
And considering that the Veil has been alluded to actually NOT be a physical barrier, but sort of a collective illusion that touches more the mind of the living I'd say that "his people"... may be pretty much everyone.
Thing is, when the Veil itself would lift, they'd all likely experience a 'hard reset' - it likely will lead to shedding of all their previous identity or they'd be made forget about them (no time travel would be necessary, if Solas will just make the world forget about things. We know Evanuris were capable of making powerful entities forget how to wake up and I'm pretty sure that Solas himself knows that trick as well, even if he needs some sort of elaborate ritual and accumulated power to amplify it). Such scenario effectively means "death" to their old selves and all races that 'evolved' or appeared after the Veil was created*, or perhaps even earlier than that, prior to Evanuris getting the bright idea to mess things up.
*(... because yeah, I'm still waiting for a bombshell when it's going to be revealed that EVERYONE descended from the elves, but they've had to "evolve" in some way to survive in new reality).
edit: modern elves are likely the group that either consciously or unconsciously remembers being what they were before the Veil the most of all people, even if it's not enough of a memory to guarantee the survival of identity in the 'new' world.