Definitely stubbornness is one of my biggest pet peeves.
I hate when I'm explaining something to someone who apparently doesn't know about the subject I'm referring to. I try kindly to detail it in order to making the information helpful and stuff, but them don't cooperate. They always bring out the bad side! They think I'm trying to show off and make up something in order to put me on a trial. I thought of changing my way of expressing myself to others, but it wasn't worth. I don't know whether it has to do with pride or stubbornness, because they always keep insisting on showing their opposing side of view, even knowing they're wrong. They just want to 'push me downhill'. It doesn't happen only with me, my bff Jessica also goes through it.
Just my luck.