What's your weird/irrelevant jiu-jitsu ick?

Give me the weird hills you'll die on. I'm talking no-shirt under gi guy rolls, long sleeve top with shorts, etc. What un-serious gym/personal things do you dislike?

I hate the thick belt stripes and think they look bad. Like professor bars are one thing but I just genuinely dislike the look of the .5 or .75" tape on a belt.