This is literally my first post on this forum ever, so I feel bad that I'm posting about the negative stuff, haha.
I guess the most annoying thing at a con for me is a tie between the elitism that can occur and people not cleaning up after themselves, there was trash in the park on the second day, and I was like, "PEOPLE PICK UP YOUR CRAP."
Though, really, my experience at Kumoricon has been pretty good, at least last year was. My first year, 2011, is one I do not like to remember too fondly. Last year though, that was fun. I talked to a bunch of really sweet people, I got complimented for my cosplay, (which was a lot more complex to make than I expected), people took my picture (this one lady recognized my Snufkin cosplay, and had me take a picture with her and her kids, saying I brought back memories) and I didn't have any 'weeaboo' encounters. The only thing that kind of stunk was that the shoes I was wearing were KILLER on my feet. So that's the other thing about cons that annoy me, when you are so hyped to see all, do all, experience all, you poop out before it's even over.