Buck

If someone is being harassed or insulted in a dojo, my advice would be

1.) stop going. Sure you may have feeling of anger, victimization, etc. and you might want to get back at that person any way you can.

2.) Don't get back at them. It the best way to do things. Seeking revenge isn't justice when someone insults you. Walking out and not coming back is.

But, if you do seek revenge for an insult or sexist remark it is a reflection upon your character. Think about Rosa Parks, MLK, Gandi, etc. where their injustices where graver, did they have revenge in their hearts, no they didn't. And that was what made them so strong to carry on to change the world.