How do I tell my best friend that her new dude is a dick

He was just kinda acting like a douche bag I asked her if she wanted to come over for some drinks and before she could even answer her bf was like "no she's coming over to my house" even tho he has been staying at her place for a week now and I invited them to come to the rocky horror picture show with me and my guy friend and once again before she could answer he jumps in "your new dude likes to watch drag queens dance around in underwear that's just not normal" so she said no even tho she wanted to go before and what makes me more mad is that he was throwing shade at my friend who he has never even met