I was doing squats today on the Smith (shut up - I like them for now) with a whopping 30 lbs. loaded on the bar. After my first set a guy who had been on the fly machine for about 20 minutes (but cute at least) came over: "I dunno if you're on a special training program or something, but I was told to never EVER take your squats past a 90 degree angle at the knee." I didn't want to offend him, so I complimented him: "Well, I'm sure if I were squatting as much weight as you probably do it would be a bad idea for my knees, but this is just 30 lbs." He apologized and said "I just don't want you to hurt yourself." Dude, Peter was at the desk and said my form was great today. So what do you do? Do you roll your eyes? Do you mouth off? Or do you just ignore them and never even pull your headphones off?