I thought it made her more human. Part of the challenge of writing characters of exceptional ability.
I wouldnt' say making someone an asshole makes them "more" human. It just makes them an asshole human. You don't have to be a genius to be an asshole, so that's not really a good indication of exceptional ability. Besides, genius or not, openly mocking and laughing in people's faces for being unaware of the capabilities of vibranium (because your society actively kept it from the world), is just plain rude.
This just popped into my head but, given that behavior of "asshole because I'm smart' you consider makes her more human, do you think the same of the new Sherlock show? Because he's a grade A asshole, and I wouldn't say it makes him human. In that it's framed as the thing that sets him apart from everyone else.
*shrugs* Eh, anyway, didn't like the character, hope they let her mature a bit, because I don't want to watch an entire film centered around an arrogant know-it all. It's why I don't watch House, Sherlock, or Rick and Morty, and others like it.