While we're on the subject of pet-peeves, I hate it when people speak of an "existential threat". That has absolutely nothing to do with Existentialism.[1] What people probably mean when they use that term is "a threat to ___'s existence". "existence" != "existential".
I also hate it when people say "hackers" when the proper term for what they mean is "crackers".[2]
And I hate it when people say "Linux" when they should properly say "GNU/Linux".
But I rarely complain about these pet-peeves of mine, since I recognize that language is a living, changing, growing thing, out of the control of any one person or small group of people, though the French language police[3] and dictionary publishers may disagree.
[1] - http://plato.stanford.edu/entries/existentialism/
[2] - http://catb.org/jargon/html/C/cracker.html
[3] - https://en.wikipedia.org/wiki/Minister_of_Culture_%28France%...