boyfriend mom dislikes me

Summer
My boyfriend & I have been together for 6 months & Ive always felt as if his mom didn't like me, it's just the way she is. But she called me & my mom a liar, for literally no reason, just because. she doesn't like either of us & I don't want it to come between me & my boyfriend, I care for him deeply & don't know what to do, any advise?