What is the deal with this? bf/gf drama?

I have a boyfriend who unfortunately has a child with the female version of satan.. she sh1ts all over him and he continues to be nice to her.. he tells me "it's for my child's sanity" but she takes her anger out on the child and him anyway so that is a crock of sh1t!. I have yelled at him numerous times that it p1sses me off that he lets her treat him this way.. what man would let anyone do that to him? is he just a p*ssy or what is his problem?!