Just coz you SHOULD pick a certain fight because it's right, doesn't mean you MUST. If you don't have the spoons or the stomach for a fight, you absolutely do not have to fight it. There's nothing wrong with letting a shitty thing slide and don't let anyone shame you into fighting fights you can't afford.
Sometimes I've slunk away from confrontations and felt bad about myself. Then later I'd look back, and be like holy CRAP I'm glad I didn't engage with that.
Trust your gut without shame.
This is an instance for people who find Nazis more offensive than nipples. Queer friendly, trans friendly, fine with tagged nudity, will block harassing instances without hesitation.