I don’t think I’ve ever really offered “advice” as such, I maybe mention a tricky bit of the trail and frame it as a discussion on “the best way” to do that Corner/root/drop section so they don’t feel like I’m taking the piss and let them pose their own ideas…
As a way of proving your “skillz” actions speak louder than words I find, be friendly and helpful and then nail the trail, don’t be superior or aloof…
This is all assuming you’re “On it” not that I always am…
As for taking advice I’ve had one bad experience with an “out of action riding God” who felt the need to tell a Hung over me where I was braking wrong during practice runs (He was absolutely correct in his assessment, but was not particularly diplomatic), otherwise I’ll take most advice on board, it’s often easy to see where someone else is going wrong when watching only a fool wouldn’t listen…