I've only been to Kumoricon once, and it was last year, but these two things bugged me:
- People deciding that yelling to you that you look like a cupcake is a good idea when you're having a conversation with someone else. I showed up to kcon, saw someone I had commissioned some jewelery from, chased them down before they got away, and attempted to have a conversation with them while some crazy chick yelled at us about how we looked like cupcakes. We were standing on the landing of the stairs, just chatting, and this girl is literally yelling over our conversation at us. We were both in sweet lolita, along with another girl with the person I had commissioned from.
I can't speak for the other girls (the sweet lolitas) about them being rude, but no one tried to talk to me the whole time I was there except for the sweet lolitas. XD My skirt wasn't really the right shape though, so I wasn't poofy enough to attract the attention of the cosplayers.
- Those freaking cat ears with the ribbon stuff hanging off of them. They are so cheap looking! One of the first things I saw upon walking into the lobby for the first time was an L cosplayer wearing them. I proceeded to see them everywhere.
And then I just remembered something that happened to my friend while we were there, so I guess I have three pet peeves.
- People correcting costumes. This was mentioned before, and I can't believe that people will actually tell people to their faces that their costumes are bad! I was only at kcon for one day, and my best friend was dressed in a silly little cosplay as Father from Azumanga Daioh. It was just an orange felt head with Father's face on it, and she was wearing an orange dress. It was a week-before kind of thing, and we had never been to any sort of anime gathering before, so we didn't know what to expect. Anyway, my friend was asked for her picture a couple of times, and one of the times was by this college-aged guy who then proceeded to tell her that her cosplay was wrong because she didn't have a tail or something. She was sort of like "wat" because English is her second language, but we all agreed that the guy was pretty rude.