in soviet russia nerd ignores you.
To intentionally and blatantly ignore someone is rude
To simply not happen to pay much attention to another person is possibly common
Varies enormously... size & type of class, type & place of college.
Usually people are strangers at first, and slowly get to know each other.
Introverts and shy ones will hang back the longest.
Some people are always loners and prefer it.
Others fear rejection and just need gentle acceptance.
If the behavior is unusual and just like a hurt, yeah, its good to ignore.
This is the only way I know to say it.
Depending on the situation
Depends on the clicky group the kidis trying to gt into I guess
Sure...if you`re married....