My boyfriend hates my mom...not the other way around. we are on vacation visiting my family and.,.?

My boyfriend drops the bomb that he hates my mom. he thinks she's overbearing and he feels like he's "under house arrest" this came out of the blue because he seemed to be having fun. I just don't know what to do because i can see where he is coming from, my mom has her flaws, but she is my mom and I love her no matter what. (i am not saying she doesn't annoy me too.) the problem is that now this issue is hanging over my boyfriend and me and it is breaking my heart. All i wanted was for him to like my family. the hardest part is that my mom loves him. she thinks he is amazing and now he hates her. I have no clue what to do and I am so heartbroken because I don't want to loose either of them but if it came down to it, I've had a boyfriend for almost a year and a mom for 24 years. Any advice?