It often has happened me because i look really young that IB FA's will suddenly want to allocate me in another seat that's not emergency exit, to give my emergency exit to some man playing the charming attitude with the FA. Or couples with a baby... that suddenly want my seat, and YES... they all ask me to change. I think thats irrespecutful and abusive behavior of all these folks.
Not always this happens, but when they approach me with the behavior i stay put on my seat!! I have the right and that's my seat, i am OW Sapphire and this is one of my achieved privileges. If i book a seat 1 or 2 months in advance, it's mine. Period.
This just happened me once or twice on IB. FA's get pissed off that i don't give away my seat to the "gentleman" playing the charming attitude. In any other airline i had experienced this inconvenience.