Well, I have no problems taking advice from someone who is 2000x smaller and weaker than me. Actually, I consult my training with one guy who is very strong (mainly in the bench) and other guy has totally different priorities. Yet I respect their knowledge about biomechanics and physiology so when it comes to technique, details about how to avoid injuries etc. I get advise from them.
Facts are facts, regardless of who says them. But when some old fucktard comes to me and starts rambling about how this weight is too much for me (because he thinks just because I'm not big fat slob I'm "weak" - go figure) and then continues with some magical mumbo-jumbo then I want to crush his head on the fucking wall.