re: What would you do in this situation?

Tough situation, but I'd probably have done the same.

This just happened to me:

I do rack-pulls in the smith machine my apt has, we have no other bars so deadlifts aren't all that viable. I figured I could go in this morning and not be bothered by no one being there at 9:20am. Nope - ole baw rolls in and critiques me stating, I shite you not, "your doing deadlifts wrong there bro." This was during my 2nd set of 5 total. I explained what I was doing briefly, but not in detail as to why deadlifts don't work in a smith machine. Ended up leaving because I absolutely hate people .

in other words...Why can't people just mind there own business in a gym?