Do you have a character flaw that you find hard to tolerate in others?

I have a saying stuck in my head and I can’t remember where it came from. (Possibly The Great Gatsby). Something like: “We find it hardest to forgive those traits in others which we dislike most in ourselves.” Do you agree with this? What is yours?

I am absolutely sure mine is flakiness. Haha. I am a work hard party hard sort of fellow. I’m not a space cadet or anything like that, but I feel bad that I often have to cancel plans at the last minute usually because of health problems. And flakiness in others just drives me nuts. And…. for some reason, I seem to attract all the flakiest people in the world to my circle of friends, haha.