This problem shows up fairly often on Pprune-so you can see that you are never alone, even in a two-man c0ckp1t.
Be extra careful to never state the first or last name of the person. After you tell two or three people ("Oh no, it is safe with me...), somebody will betray your confidence and tell the guy that you were complaining about him. The "old boy" club? Being part of the younger generation can make you an outsider.
Men are just as bad as women, when it comes to gossip and rumours. Maybe worse.
I once made this mistake (among others).
