What do i do after girls squeeze my arse, twice its happened in different places.
Do i try and kino escalate, do compliance or actually join in and neg?
What would you guys do and what would work?

I'd say "You think you're hot and you can just touch a guy?" Or I'd go with the classic mystery "hands off"

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Turn and tell her "that will be 5 dollars."
Or, "I bet you couldn't do that again." evil grin.

If she goes for it use your arms at her waist level to keep her in front of you. Wehn she doe make the move to grab return the grab and use a neg if it seems needed. "wow, you do a lot of sitting don't you?" if not say, "you could at least by me a drink before you embarase me."

If she doesn't go for it and gives you a yea right look. say "well I guess your hand is stll on fire from the freeby. I was gonna make you pay for the next anyways." and turn to walk away.

You'll either walk away with your chest out and her thinking she should have done more. Or you'll get your ass grabbed again as you walk off. In which you can grab her by the waist and take her to a spot to talk. On the way grab her ass and say. "Hmm, i think you got the better end of this ass grabbing thing." and smile.

This.
Guys can't just randomly touch girls so why would girls be able to touch guys? Simply tell them to fuck off (not literally, unless you like to). Do it in a playfull way if you want to give her a shot in winning you over (if you like her).

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Optimistic?