[Ant.]

I've no idea on how far in you are with your relationship but you clearly know your boyfriend better than your mum, your mum veeerry likely just had a bad first impression with him. Also I could only guess there's an inkling of "my daughter deserve better!" and her wanting you to have what's best, and even if he is the best for you (I feel bad using 'if' but as I say, I don't know him) your mum wouldn't know that

what matters is your happiness. And besides, some people that don't like each other end up being the best of friends. Who knows, your mum and boyfriend may become the best of friends