There’s a truism connected to working in or exploring the entertainment industry. For all the positive feedback and experiences you may have, one bad experience or comment can ruin your mindset for a long time. That kind of experience cuts like a knife, making you think that everything you experience from that point on will be that bad or worse.
This definitely holds true for conventions. I’ve been terrified that every event, con, screening, etc. I’ve gone to since AnimeNEXT will be a colossal disaster that puts me off real world fan culture for good.