i think that this is a situation that you deal with with the other passenger. you don't get the fa involved. if its not being worked out, the flight attendant will likely come over and ask, "is there a problem here?" but you really do not need to initiate the situation by bringing a flight attendant into it. i think this is one reason why flight attendents are so angry sometimes, they have to deal with petty disagreements between pax. either let it go, or deal with it yourself. however, i would have to say that the op did a good job of not making an issue during boarding when many non-frequent travelers are tense and just want to get to their seats and the fas and ga are trying to make sure everything goes well so they can get the plane of on time. thumbs up for that.