In your experience, what are some things that made a woman "bad in bed"?

I'm (30f) curious to know what things can make a woman bad in bed. Sorry for the throwaway - a lot of people in my life know my Reddit handle.

I like to think I do alright, but you don't know what you don't know. I hope that a sexual partner would be comfortable telling me if I do something that turns them off, but it's a difficult subject to broach. It'd be useful to find out from men who sleep with women what things are bad to do in bed or can kill the mood. That way I can make sure I'm not accidentally doing them.

(Or at least, I'll try my best. I don't usually think about Reddit in the heat of the moment).

So men of Reddit - what are some things you've experienced that you felt contributed to a woman being "bad in bed"?