Because social anxiety, typically. “What if the person tells me to fuck off? What if they make a scene of it?” Especially if six years ago you are the person who was in your teenage years, chances are your social skills are not what they could be if you didn’t spend a year in lockdowns.

Conversely, if you are the kind of person able to come up to a stranger and ask them (politely and respectfully!) to change what they are doing, you likely the person with the social skill to do other things well too.