ORIGINAL: Happy Feet
pilots who fly lower quality and skill level planes, criticizing why you did this and why you did that. You should have done it this way or that way. All aimed at planes a few years away from their current level.
I fly scale type airplanes and have had this happen to me. I politely tell the individual that I build a plane to suit me. If he enjoys it then I'm glad. If he doesn't like the way I did something then I tell he can go build one to suit himself.