Ignition Override,
Out of all the posts, I like Bealzebub's replies best....showing him/her that you are annoyed by his comments and using a bit of diplomacy in your response is usually the best long term answer to situations like these......
I can relate to this situation too .... I consider myself to be an easygoing captain and like to keep a cordial atmosphere in the cockpit but there are some guys who take advantage of that , maybe they're irritated at the fact that they've got all this experience and they should be direct-entry Operations managers but are stuck in the right seat with a younger/less life experienced captain . It's actually quite tricky but sometimes recognizing their extra skills and giving them extra responsibility does soothe their over-inflated and hurt egos.....
best of luck with this person and hopefully it works out for the better