When women hit on men it means two things:

  1. You don't threaten me.

  2. I'm not intimidated by you.

I don't know if this is uncommon because most men feel good when women hit on them but hitting on someone itself is an aggressive move people do to those they think are "below them"(as in not intimidating to them).

So when a woman hits on a man she's being a little passively rude and signaling, "You're such a little man that even a girl don't feel threatened or intimidated to hit on you ".

Three things :

  1. If she hits on you she's the type to be a passive aggressive bitch in a relationship.

  2. She's not romantically interested in you, if she was she wouldn't be aggressively hitting on you as an attempt to emasculate you.

  3. Tell her to fuck off because she's just being a passive aggressive bitch questioning your manhood trying to make you feel emasculated.

(Bonus) 4. Telling her to fuck off will have a good enough impact on her so as to think about you enough to convince herself she's into you thereby increasing your likelihood of getting with her.

If a woman aggressively hits on you and you're into her then tell her to fuck off if you're not into her tell her thanks.