This is a common issue I have seen, and judging by what I read online, it happens pretty much everywhere else too. The offender is usually male, but I have had females guilty as well. It goes like this: New or newer gun owner comes into the store or range looking either for basic instruction, or for advice on purchasing a first gun. They, wanting to get good advice, occasionally bring someone along who is a self-described 'expert' on guns. Usually this person is the 'just get this pink charter arms .38 revolver, simple for a woman to operate, and never jams' guy. So, the question is; in general, how do you best deal with this situation? Usually the person has been asked to come along because their opinion is seen to be valuable, so just brushing them aside or immediately calling them out as an idiot is not usually effective. Stories of how this has gone well, or even not gone well, could be a valuable contribution to the discussion. Ideally this, and other similar threads, can be started to become a source of help for others dealing with similar situations.