Commenting on a woman’s weight in a negative way, especially after having kids and/or when he’s not even in shape either.
Calling women “females” while also calling men “men”.
Any dude who keeps trying to hit on me after I say that I’m a lesbian.
Any sort of condescending tone or comment. Nopity nope nope nope.
Mansplaining. Look, I like to learn. If I’m interested in hearing about a subject, or getting someone else’s knowledge about a subject, I’ll ask. But to just assume I don’t know is incredibly rude.