LOL, because it isn't 
Oh-ho? Let's see which one of these is unsuitable.
Is he old? Even without stasis-sleep he's implicitly hundreds of years at the least.
Bald? Well, I'm not seeing hair on top.
Genocidal? That's a very fair assessment of his plan, given not only his warnings, and his endstate, but also the means by which he already tried to execute it (the Breach).
Racist? Absolutely. Not the charicature many have of racism, but he's raically-specific cultural chauvenist who denies the personhood of other demographic groups not his own.
White? Doesn't get much whiter than him.
Guy? Yup.
Dresses like a hipster? Probably the most debatable, since there isn't a clear definition of hipster style (which is, in fact, the point).
It's a strange sort of racist that showers Inquisitor with approval every time they show they care about others no matter of race and does what he can to save people from suffering, including revealing himself and his plans to a person/organization that has a chance to stop him (even if they despise Inky) and stopping an invasion that would plunge South in chaos and likely help him further his goals without anyone the wiser.
Not really strange if you actualy are familiar with non-charicature racists. Racists are quite capable of empathy for people of other races. Racism =/= lack of empathy. Being racist derives from categorical views, motivations, and beliefs, and intentions.
Solas is not looking to save the South, but merely to destroy it on his own terms for his racial revaunchist agenda.
And yes, Solas was totally such a Hitler once already that despite absolutely loving the Fade and spirits he was forced to hurt them by creating the Veil, and - from the looks of it - now stands in a sort of a similar devastating dilemma that nobody in real life had: a prospect of either part of the world, or perhaps even entire world eventually dying or losing a part of itself that is important, while you have a chance to stop it, even if for a terrible prize that will eventually utterly destroy you.
This argument presumes that Hitler wouldn't have hurt members of a group he claimed to care about.
He kind of did. A lot.
While I'd certainly agree that Solas isn't a Hitler, the difference is in style, not malevolent effect. Killing off and subjugating the majority of the world for a tiny minority to rule over in glory isn't what's different.