Halfwit is being picked on. Lisa doesn't like him because she is a jealous hateful bigot and has spent most of her time in the house persuading her cronies to make his live a misery in the house. I admit he is annoying but if someone is annoying then surely the decent thing would be to have a word or avoid them and not turn the house against them because you feel threatened by their superior intelect.
As for him bitching, then good for him because he has most of the house against him and it's nice to see him standing up for himself. He doesn't use complex language to bitch. It's called a vocabulary. Lisa's legions just lack either the intelligence or language to hold a conversation with him even at the most basic level.
Kris is history already
People feel sorry for him