For starters, unless someone is a total dick no one is going to make fun of you for not being amazing in the park. everyone has to start from somewhere. The only people who usually talk shit, or that are mouthy are younger kids. I'm talking about the little kids that yell on the lift and grill you in the lift line. Your initial response is to be intimidated by these shit talking kids who may have some skill. You then have to realize that these kids are more than likely rich little pussies whose parents buy them everything, and thus have some attitude problem. From here you can either man up and ignore any shit talkers or nay sayers and learn your stuff or you could do what black steve would do and get in their face. Talk back and don't be afraid to throw down if the situation arises. Claim your turf and show those little pussy rich kids what's good.
If the situation you are in is far different than what I have referenced above I would do as so; don't worry about what others think (this will give you the I don't give a fuck g steeze), get a crew-it's much easier to learn/progress/have confidence in the park if you are rolling with homies, don't hand bird, don't claim, and don't beam if you land a trick-common courtesy, smoke weed-it will help you meet people, say whats good to the "park rats" most of the time they will be good people who have the same love for skiing that you do.