What is the right thing to do.

If that would happen to me, I would beat that guy up right there on the spot! It's very stupid to do it and to get out unharmed. Maybe others would overlook it, but I won't cause maybe it would give them the idea that your'e scared or something and will do it again. It's best not give them such idea.

Well with me I would have to say something probably not nice then tell them to leave my home!

Hello drm. If someone came into my home and even if they were invited and that person insulted me or another guest I would absolutely demand that they either apologize or leave. I would consider my self a very poor host if I didn't. I did this once to my future brother-in-law and after that when ever he came to my home he was very respectful. I feel that if I did ask them to leave I would be desrecpting both my self and my guest.

I will kick him in-front of guest, and i will try to declare him a mental case. We knows this popular quote " As you sow, so shall you reap". :-)