President Barack Obama -- Opinions On Coffee Salute ... Split Half and Half

President Barack Obama's casual salute while walking off Marine One has landed POTUS in some very hot water.

Barack and Michelle Obama touched down in NYC Tuesday to speak at the U.N., and he saluted his Marine Corps guards while still gripping a cup of Joe in his right hand.

Critics jumped on BO, claiming it was an un-Presidential break from protocol -- while supporters call it

Obviously, the White House didn't think it was a big deal since the vid was posted on its official Instagram.