I don't know which gym you go to, but my university gym really does not have these problems at all. Without trying to generalize, try to find a gym with better educated people. I have to agree with you though, people who do a lot of weight with terrible form usually attract the negative part of my attention as well. When they are screaming/showing off I usually just get down-right pissed. However, they barely ever do, and I've politely corrected a lot of other people in my gym (starting with "Can I give feedback on your form/Are you aware of your form"). Yes, I know giving advice without being asked is something MMO-C people here also get annoyed by, but when I see someone potentially ruining their knees for life with a horrible squatting form, my arrogance/good nature gets the better of me.