People who don’t thank you when you let them into traffic, a simple hand, even a finger of acknowledgment, it’s not that hard.
People who park across your driveway, even though you have signs up!
Big car / big brand / expensive car syndrome, whose drivers think they have an entitlement over every other driver, on the road to push in, not wait, or just drive like absolute idiots, I’m normally a very accommodating & courteous driver & let plenty of people in/ out etc, but I recently had an incident with a flashy Merc driver who decided he could circumnavigate roadworks, drive the wrong way where it clearly said road closed, & try to force me to back up, nope, he flicked my stubborn northern bastard switch ( I was in London) & refused to move, & none of his wild gesticulations & frothing at the mouth was going to sway me, after what seemed like an age I pointed at the one way, roadworks sign, & the now large queue of cars behind me who managed to obey simple rules, who were now getting pissed off & honking at him behind me, & shrugged, he realised he was being a massive prick, & reversed & squealed away red faced.