How nice/helpful Rhys was during the TDM was very confusing for Rocket. WHY ARE YOU SO NICE there must be a reason.

But if Rhys needs to get into a big fight with someone and just get all that pent up emotions out of his system, Rocket is an easy raccoon to offer up for that. Also, the fact that he's struggling with this feeling of shame for being half-demon, the nice thing about Rocket is, he'll probably see that as a good thing (humans are overrated, except for Peter), so that could be some great positive reinforcement from someone too!