Yerp. Mother of the Year right there. It's almost a stereotype of neglect or something. "Have baby to make myself feel better, oh wait, it's not working, don't want it now."
I always like this version of B5 best for it though. He's definitely an ass, on occasion, but he mellowed through the years with prolonged contact and acceptance by the Legion, and it's like the social awkwardness and assholery had a direct cause rather than going with the stereotype of a smart person being emotionally stupid.
In this Brainy's case, he had abandonment issues, a very cold and even verbally abusive upbringing (I mean, come on, they were calling him a "twelfth-level freak" to his face before he could even walk), and otherwise was raised without much contact with anyone that loved him. His life wasn't, like, the classic abuse kinda hard-luck life story, but it was very cold and depressing, and made it so there was a lot of sense in him having difficulty processing and expressing emotions, to the point where he pretended they weren't there when they were.