You were right to get up and leave. Good for you! Where he's coming from in expecting you to sit there and tolerate that crap is utterly beyond me to fathom. As the old saying goes, "You teach people how to treat you." Keep teaching. However, some people are just not educable. The family may not be, and that is not what's most important. But, if he is not educable, then you may have to walk.

The issue with your daughters may be related. Mabe they are just doing what preteens and teens do in not being gracious to your boyfriend. OR: maybe they have figured out that this guy is not coming from a good place, in terms of what he is all about. IDK. What are this guy's good points?