Boyfriend's friends have been mean & disrespectful:Advice?

Anonymous
Sorry this is so long, but I promise I'm not just rambling for no reason :) My boyfriend and I have been dating for a little over a year, and have been very happy and loving toward each other. We've both said numerous times that this is the best relationship either of us have ever had.

He has a group of very close friends- many of them he's known for 15 years or longer- and recently several of them have started lashing out at me. The breaking point was one night when I was out with my boyfriend and 3 of his friends, and one of them (Casey) told me he thought I treated my boyfriend like crap and I'm not good enough for him. Me and my boyfriend left after that because I was starting to cry and the whole night seemed ruined anyway (bf was just as angry, surprised and confused as I was at Casey's outburst. He said nothing like that had ever happened before.) It was really pretty shocking, and even though I know I love my boyfriend so much and try to treat him really well, it made me feel terrible about myself and second-guess everything I've said or done in our relationship.

That happened a week ago, and today Casey sent me an email. He apologized for making a scene but then he repeated that he thinks I treat my boyfriend badly and that maybe the problem is that he just doesn't like me personally. At first I was relieved to see him reaching out and contacting me, but now I just feel put down and insulted again. What is the best way to respond to him? I want to show that I am not a bad person (I'm really not) but I also don't want to open myself up to get trashed again. Advice?
Boyfriend's friends have been mean & disrespectful:Advice?
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