I have stabbed people with a fork for trying to touch my food.

Just quickly lean towards their hand and snap your teeth like you’re going to bite. Works with all sorts of unwanted touching, just be ready to actually bite if they’re also nuts and try again to call your bluff. Even if they get angry they’re much less likely to want to throw hands with the high possibility of getting bit hanging in the air.

The downside is you will look even more insane than with just fork stabs, but on the plus side you will look insane enough people will stay the fuck away in the future too

Curious if this works where a woman is trying to stop a man touching her.

People are prepared for punching or screaming and shit, but usually nobody is prepared to get bit, so probably even if the risk of violence is higher. But getting a chunk out of some jerk has its own satisfaction, they will remember it even if you get hurt worse