You know, I had lifted when I was young pretty regularly until I got married and had kids. Basicly I took off about 10 years until two years ago.
Then I got my act together and resumed training but at first I would go in, do my thing and Mr. know it all felt compelled to tell me what I was doing wrong, what I should be doing, bla, bla, bla.... I was working out in the morning and switched to evenings because it was less crowded.
Well after 2 years I see Mr. Know it all on a Saturday. He's fatter then me, weaker then me, but still talks his shit. Bottom line, doesn't matter, fuck them. Work hard for you.
I watch this guy pressing bench and when he is done I tell him to leave the weight where it is...he says, don't you want to warm up, and I said "yes" that's why I don't want you to strip it down" (loser). He pretends he doesn't know who I am because he realizes while I was working out he is running around giving advice.