Mother of boyfriend!!

IM SORRY THIS IS SO MUCH!! I don't wanna sound like I have typical boy friend issues but I need some advice I have to give you guys some back ground info though or it may not make sense. Ok so a while ago I hosted a beach party and got a bunch of alc and my mom found out through my friends mother I got in huge trouble(party was still lit tho)and I told my boyfriend and he told his dad who told his mother. Other info you need is that me and my boyfriend have been together for a while but just recently with in the last 2 months have started having sex.

OK SO lately I've been getting hostile vibes from his mother and I never was before she claims she loves me! but it's all very sudden like with in the last couple weeks and don't get me wrong his mom is great but trust me she's VERY stuck in high school you know very very catty and gossipy and loves to drink alcohol herself! However tho almost every time I go to his house she mentions the alcohol and how I'm "not so innocent" EVEN THOUGH SHES AN ALCOHOLIC like scuse you don't be judging me and I'm not like that sort of kid I'm an honors student and enrolled in like basically every science class there is and I'm in like a bunch of in school and out of school clubs like she shouldn't be judging me for just one mistake!!!

AND on top of those "not so innocent comments she always makes inappropriate joke about me and her son having sex or something and it makes both of us insanely uncomfortable!!!!

So this morning when we woke up we had sex bc you know why not I'm on the pill he had condoms and we felt like it nothing wrong we care being super super safe!!! But he threw the condone box away in the trash and covered it and later we find it sitting on the kitchen table when we get back from a walk and his mom is home??? Later she was bugging him about his bday present and goes oh maybe you guys just want a whole barrel of condoms and continued to joke about us having sex LIKE WHAT.

I felt so uncomfortable right then I barely said a word for the rest of the day and when my brother picked me up I ran outside w out saying good bye when he was in the bathroom:(((

Later I told him that that made me super uncomfortable when she mentions the alcohol and the sex and he talked to his mom about it and how it make both of us feel super uncomfortable (and not like the sex talk uncomfortable like why are you joking about it in such an immature way uncomfortable) her response was "I'm your mother I can say what I want" he finally convinced her but I mean today it was get her to stop or we are over. I don't know how his mom is going to affect us in the future!!!!

If you've had almost similar like hostile boyfriends mom experiences I just need advice on how to deal with it.