You forgot someone who called her ugly as a monkey. Dorian has a pic of him turning white. Even without saying anything Cortez was one of the least romance character in favor of a light skinned guy like Kaidan (Granted, I romanced Kaidan but still)... With Dorian, you can see that he's near the bottom alongside with Josephine, Ironbull, and Viv. What's the connection between those characters? I wonder.
I really believe that Dorian would be much higher if he wasn't the gay choice. I also think Cortez was largely prioritized lower because of story issues. I always romanced Kaidan because he was a companion with content over three games. He had opinions about the in-game world and a decently complex history. Cortez was an NPC in one game and I didn't seem to get anything out of him besides the fact that he was friends with Vega and he had a husband that died.
There is definitely racism at work towards some of these choices. Vivienne especially has copped a ridiculous amount. I'm not denying that at all. I just think we should look at all the reasons why these characters might not have been that popular. With some of them, I think it's more complicated.
To be honest, though, I would expect Dorian to still do better than Iron Bull or Varric once they get in the "real" game statistics. The BSN is way more into non-humans than the general numbers turn in. Whatever they get here, you can knock off at least a few points and tack on a few more to humans. I would bet on that.