Read through this whole thread and other than some intelligent and introspective responses, its like a gossip session. Is that Alpha? Manly? Who cares what anybody else does, says, or wants to be.
I get it though, I see the skinny guys that have some muscle to show flexing it up and taking selfies in the locker room mirror. Though I've never been approached with advice.
I just remember how important image was to me back then. And yeah, it was all about the girls and getting pussy.
On the other side of it maybe that skinny dude got picked on when he was younger and finally has some confidence (albeit misplaced) and offers advice. Why would that upset you so much? Maybe he's just trying to make a friend. Yeah, some younger guys have big Ego's. Guess what, you did too! At some point we all thought we were on top of the world and "the shit" I know I did. Then I'd get put in my place. LOL. But at some point we grow up and become more humble.
My annoyance at the gym is anyone that has to work with the dumbbells mere inches away from the rack. Or has a fucking yard sale at the power racks and uses the flat benches as a lawn chair between sets while they play on their phone for 5 minutes.
And size doesn't dictate experience, or knowledge.