Sometimes when you have left a local level series to show at a higher level, there will be jealousy (sp?) I don't know how old you are, but teenagers can often times be the worse, although adults can sometimes not be far behind. You just do the best you can, and question WHY are you going to this show in the first place. If it's to see friends - don't go. If it's to work on you or your horse, do what you need to do to accomplish your goals.
For example - I grew up showing at the local county fair and local series, but my parents provided me with the opportunity to keep advancing, and I eventually moved on to QH shows. I have a retired mare that hasn't been shown in 5+ years, and is actually a broodmare now. I went with my parents to the county fair (they were on their rope horses) and showed her. She was out of condition, and hadn't had a saddle on her for over a year. Literally pulled out of the pasture, bathed, and clipped. People about had a fit that I was showing her, because it was "unfair" and "cheating." I had gone to have fun with my parents, on the most "fair" horse I had, and those people almost ruined my day. But I was there to have fun with my family, to ride my old horse that I grew up on, so I did. It made the day harder, and I don't know if I'll go back. But if that's the only show I can go to with my family, then I will