See, I'm left handed, but I do this. I say "how do you write like that" to my right handed comrades because righties are the ones who write weird, and "you're a lefty?" to other lefty comrades to confirm our left-handed awesomeness.
A recent study shows that left handed people are more likely to have an IQ over Left-handers are also better at using both hands at once, and that may partly explain why it’s more common for them to be proficient musicians or professional.
Or the teacher teaches a technique the right-handed way, then they tell you "just reverse it!" because they can't figure out how to demonstrate it left handed. Then they act like it's easy to reverse EVERYTHING I'm shown. I'm not bitter or anything :)