I agree 110% I love it when I go to the squat rack and someone is on the rack next to me squating big weight, yet their range of motion is about 3cm. I get up there and squat ass to grass and put that person to shame.
Tonight was leg night, after three sets I was limping a little and a regular (who thinks he is a hard ass) says "what`s wrong with you?" I point to the squat rack and his reply is "you only doing 225?" WTF? I politely informed the dumbass that it`s not how much weight you move, it`s how you move it.
What`s even worse, I have had many people come up to me and say stuff like..."you know you really shouldn`t go below parallel, it`s bad for your knees." Yeah whatever, that`s just what people with chicken legs say.