From my own personal experience, it doesn't sound like these guys are intentionally trying to wind you up.

Firstly dance floors are crowded places so if people are bumping into you it probably isn't through choice. You shouldn't be so self concious. Also when you are on the dancefloor standing still necking people will bum into you as they are moving and you are still.

Secondly is the dancefloor the best place to "make out" with a girl? Yeah maybe if you're having a dance you can tease and have a quick pash but have a little respect for her and yourself and take it somewhere else because if you find a secluded place to sit, you're more likely to bond and have here pulling you out the front door by your flies.

If both of the above fail, just turn around, get eye contact with whoever is pulling your chain and ask "is there a problem champ?"

I hope my post doesn't come across as harsh but keep the dance-floor for dancing...