The jab comes from having someone set themselves up as an expert, the responses are a way of saying 'who says that you know everything??'.
I see that skyslayer is from Swaziland, I don't know the culture there but think this is a genuine offer of help. Whereas in USA and Australia any 'tall poppy' who sets themselves out to be an expert is immediately cut down.
It reminds me of the story where some ignoramus sets out lecturing at a dinner party about some particular subject as if he knows it all (but doesn't) only to later learn that one of the guests was a university professor specialising in that particular topic!
I suppose the RC equivalent here would be for me to set out step by step how _I_ do piro-flips (BTW - can't!!) only to find that colorex is really Alan Szabo.