I dislike Rex in his current capacity. I don't think you have to love or hate him.
I like it when people speak honestly, and I don't think I've been bothered by the things Rex says (except when he says "and things like that"). I sort of disliked him when he was with the Jets, but I didn't remember why. I managed to like him well enough at the start of last season even.
I stopped liking Rex after watching him throw throw a few tantrums and draw a few flags. What has finally made me dislike him is his sloppiness. It's his job to keep things organized, the buck should stop with him, but he's just sloppy. It's unprofessional. IMO he's a great coordinator who's players have loved him and that got him his HC gig(s), but he's lousy at it. I don't think it will take that much for me to hate him, but it won't be from him talking.
Thankfully its a players league, hopefully one of them will be able to lead this team, b/c he won't.