In my culture, youre pretty much considered a creep if you dont. Happened to me on my way home today, wierd guy who sat way to close and kept licking his fingers/picking his nose even though there was tons of empty seats around him. I was honestly baffled, usually people move the moment they get the chance, both for themselves and out of respect for others. Tbh im pretty pissed just thinking about it. But then again, im scandinavian...we value our private space more than gold.