My pet peeve is when people don't even bother trying to compile an intelligible paragraph. I don't mind if other people don't have the best English skills, whatever. But people completely ignore the squiggly red line underneath every third word in their sentences. That's just laziness.
As someone into diapers, I can say that it is weird. It's not bad or anything, and I'm not hurting anyone, but I feel it's something quite personal I don't particularly want to share with people who know me IRL, like my friends or my family.
I'm fairly sure the majority of people don't...