I think that the previous show with Jennie Buss started to break him.
Also, Matt had that little smirk when Gilbert was talking about him. Kwame is a family man now but you have these two still taking slight shots when he been away from the game for nine years. Everyone has a breaking point and they probably hit his during the last two episodes.
Disrespectful as fukk from Matt Barnes. Probably had a scripted kwame joke planned which he forgot so the little tap