Another one that is starting to get on my nerves (though not really in the same category as the above) is "first world problem". Person A states they have some kind of problem and person B says "tisk, tisk, first world problems" in order to attenuate whatever problem person A has. If person B is currently living in the 3rd world under 3rd world conditions, fine, otherwise stop cheaply leveraging the poor in order to win arguments.