I was just wondering if it's something only happening to the cons I attend or it's the same all over the world
Are your cons full of normalfags?
Examples may be: kids blasting trap music, guys with no shirt going around with a "free hugs" sign, people who actually don't care about anime but do low budget ""cosplay"" of extremely mainstream characters just to hit on weeb girls and generally people who can't even speak their own language