Yeah... Legolas' little slap-down wasn't quite the same, was it.
No. No one pointed out to him that it wasn't JUST the men of Gondor who were protecting Middle Earth. They just let him whine.
That's because getting slapped by an Elf is like getting slapped by your little sister.
Now if a Beorning had slapped Boromir down.....let's just say they would have needed a different Gondorian to round out the Fellowship.