Everyone in the military calls them Navy SEALS, not sailors. Yes, they are sailors, but in the military, they earn the respect to be called SEALs.
For the record, Marines aren't like this. Marines may be like this with other Marines, but that's it. The way the Marine in the story acted is unprofessional and immature, two qualities I don't see very often in Marines. And a Marine would damn sure never say "I give up."
It's just a story, and I wouldn't even bother stating the obvious if there weren't already some arguments about Marines going on.