Fair enough, I think it's a little bit of both.
I've simply found that using a heavier weight with looser form on most pulling movements just seems better for some reason, so I don't argue that they don't have a reason in correcting my form. My only irk with all this is why people feel the need to have to give advice. I normally don't work out at school, and at the regular gym I never have this problem. There are TONS of people who dunno what they are doing but people mind their business.
The guys at the gym are pretty annoying though. Same guy that gave me advice on the DB curls, literally screamed, not grunted, but screamed while quarter squatting 4 plates.