Dating

How to deal with a horrible Mother in-law?

I’m gonna try and make this short.. I’ve been with my boyfriend for a little over a year. His mom is “nice” (bare minimum) but has no problem snapping on me or telling me to do things. I am not very close to his family, his mom constantly says she wants him out, so we’re at my house most of the time.
We had some issues recently where she got mad, she had understandable reasons but the way she screamed at the top of her lungs was very uncalled for.

I found out tonight that she thinks I am “the downfall” of him, and that I’ve turned him into a druggy. We do acid every few weeks, which we get from his friends. It’s got nothing to do with me. She’s been very rude but I’m stuck at a weird point where obviously I can’t stand up or explain myself because she’s an actual maniac and no matter how nice I am will take it as I’m being “disrespectful”. I haven’t seen her since finding out what she thinks of me. And I don’t know how to even act from here on out.

Every bone in my body wants to explain and stand up for myself nicely, and my boyfriend has 0 communication skills so I know he won’t say anything that should be said. I don’t know what to do, I feel stuck. She’s judged me off his own adult actions, and drugs he was given by his own friends. I’m so pissed and upset. Advice?
How to deal with a horrible Mother in-law?
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