Is it ok to fight a Lesbian?

I recently broke up with my girlfriend because she was Bi. Her current "girlfriend" saw me in public with my friends and tried to fight me.
She started swinging at me and I completely froze and just blocked because she was a girl.
Then one of my friends punched her in the face and dropped her.

My friends told me I should have fought back because she was assaulting me but I didn't because I didn't want to hit a woman. My friend that punched her thought she was a guy.
Is it ok to fight a Lesbian?
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