A man (maybe in his 30s-40s, with a beer gut) comes and works in with me and does squats while I do my overhead press. We started talking in-between sets and somehow we got to how I do my squats. I am a beginner barbell user, but I read a lot about the forms and watched a lot of videos (the ones that really stuck with me were the Alan Thrall ones) so I think I know a little about what a good form is supposed to look like. We both do the high bar squat but his form was something.... According to Alan Thrall, you're supposed to go lower than your knees when you high bar squat but this guy wasn't even going close to 90 degrees and leading with his hips.. He gave me some 'advice' about something I don't remember and how it's bad for your knees to go lower. I didn't say anything about his form cause it's not my place. I don't have the muscles to show that I know anything (if I know anything) so I keep to myself.