Pretty sure a little girl died of Meningococcal around the area where I grew up and lead to a large push on public awareness of not sharing drinking utensils in particular.

Another prevalent disease spread around when I was younger was cold sores and another that effected my family was golden staph which a sibling of mine had an infection and we were forbidden from sharing any eating or drinking utensils with.

I guess my point is that I’m glad you’ve never worried about it. For everyone else, be hygienic and don’t suck on public pens.