I haven't really had anything bad happen to me, or at least not to the extent that it would completely ruin the experience for me, but I've definitely experienced quite a bunch of questionable moments at cons. Not furry cons, none of those around here, but anime/gaming cons!
I used to cosplay, and there were times I cosplayed as female characters, and let's just say that the sort of male attention I attracted wasn't ideal. I don't really know why males are so horny, I wasn't even good at cosplaying when I was a kid (like, I doubt I even passed as a female?)
Some people were definitely way too touchy when it came to taking pictures, and I guess it's a matter of setting limits when it comes to that type of stuff. Oddly enough, the older I am, the less that's happened, but a year ago I cosplayed this character with very large breasts and I got quite a few comments on my fake knockers while I made my way to the con. I wonder if people could tell they were fake or not, or if well-endowed females always get that type of attention?
These were really just weird episodes for me, however. My worst con experience was probably the last con I went to, there was some lame friend drama going on and the con wasn't that good either. Then came coronavirus and I've never really been to any cons since, but I'd love to! We have no furry cons, and I still don't really know if I wanna attend one someday, but I guess it could be worth the try even if just so that I can say I've tried it! There's also the Final Fantasy XIV Fanfest cons, I'd love to attend one of those in the future! Would give me a great opportunity to work on a cosplay from the game, but that's probably a matter for another time.