Okay, the discourse has sold me on Demetrius being a not so good partner and a bad dad.
But Robin ain't off the hook either. She helped perpetuate all this. She neglected Seb's actual issues and didn't do anything to curb the favoritism. Also, are we just going to forget she throws out his comic book collection? Comics aren't cheap to replace. Especially older prints. And those things can get EXPENSIVE. And she does does that without asking him!
And by this point she should know that Demetrius has something going on (whether it's ADHD/Autism/something else I don't know I'm not qualified to diagnose) and should have learned she needs to be specific with him.
Honestly, I don't agree with the fandom wanting to give them a divorce arc. Honestly, they deserve each other.
Seb and Maru need to move out and go live their best lives.