Couldn’t tell you, I’m a dirty American

Yes. All humans can get yeast infections.

… Everyone is at risk of a yeast infection if you’re wearing the same underwear for days at a time.

If you aren’t shopping or eating at establishments where employees rely on it, by all means

Yeah, and tips are the thing shifting burden onto customers…so denying servers or whoever a tip as long as that system is in place just hurts employees, not employers. If you want to hurt employers then help employees unionize. They kinda need tips to build emergency funds and shit during that process, unless you want to go the route of voting unions as requirements in the meantime?

Edit: you could also not go to stores that rely on it to begin with

Well, ideally employers just pay enough so it isn’t pushed onto customers.

Gentle request to still tip if you think service was bad. The employee could be having a bad day, something could be out of their hands, or even if they’re just a shitty worker, they can be let go after enough fuck ups. Denying someone their tip because you think it was “bad service” is part of that bullshit master-slave dynamic. Normal employers can’t deny wages if someone shows up and doesn’t do the work - they have to be fired or sent home