I'm not sure I can, nor do I think I want to continue to, make excuses for people's rude behavior. Over my time here I have heard so many different theories about, excuses and justifications for, and deep levels of understanding regarding, people displaying what simply amounts to really shitty behavior as they try to immediately establish their ego and presence in a completely new public space. I'm not sure anything more needs to be understood about such individuals that isn't blatantly obvious.
@thewebrecluse Block 'em and forget 'em. They are not entitled to any piece of you, including your time or energy.