we all get annoyed by people using heavy weights and crappy form. I got over the contempt for these people. Nowadays I just laugh at them.
My pappy taught me how to lift, and he was a state champ powerlifter, so we focused on form before weight.
I squated ass to ground with just the bar for 3 months just to make sure my form was good.
the only lift that will induce messed up form, is the deadlift. If you're lifting your 1 rep max, there's a good chance that your back will start to round at the top because the weight is heavy.