You said it...untrained!!! I can remember when o didn't know shit and worked the same muscle group everyday. Had the willingness but needed detection. It's a case by case deal. Give a suggestion and see if he cares to listen or not. You'll be able to tell if he wants direction. I try my hardest most of the time to not take my hilltop standpoint with these uninformed ppl. I try. Take your helpful eriods attitude to the street and see if its what he's looking for. It's so easy to be cool with ppl heading in the same direction here but taking it to the streets will define your reputation.

you cant fix stupid bro

Hmm, I've helped some and watched others. In my experience with people doing horrible form on the bench is because "oh, I have a bad shoulder and its as low as i can go." Whatever! Yes, some people are injured (shoulder) and others are trying to do weight they have no business doing!! If i had a dollar every time i heard that..

Lot of people get mad, say I've been training this long or trying to hit this muscle group etc. Ignorance is bliss. You could get a little laugh out of it, ask if you can work in with him. If he says yes jump under the 245 and do proper reps with it. And don't say anything wait for him to comment on it.

You can't save the world brother. Anyways most of those chumps will get offended that you are trying to help