Only annoyed when they don't want to play the games at all.
I let them lead the conversation, if they want to know what repairs I have done, I tell them. If they want to know prices, I explain the trends past and present. I try not to be a windbag, no one wants that.
If they are double flipping, I show them how to cradle, how to post pass, the advantages of single flipping. I don't tell them every single rule (unless they really want to know) I tell them how to get multiball, or something else easy.
I save the serious pin talk for here and when pinheads come over.