How to avoid being a social retard at meetups

[foxdougan]

I'm generally a bit of a social retard and with the London meetup a few months away, I'm hoping to become less sucky at getting along with people. Some have told me "if they don't like you, fuck them," but as I'm already a bit held back, it wouldn't increase my chances much :P I'm not an assburger, I'm just a social retard.

What are your tips for not seeming like a cunt and for getting along well with people (some of which you may not like) during a KATG event? What socially retarded things do people do, and how should they go about not being such a retard?