A language racist is a person that intend to correct a person that writes something wrong in their mother-language. Knowing the fact that the person is from another country and does not know the language well enough to speak/write it perfectly. The language racist will correct the person and leave him looking like a fool, which would make the corrected person feel sad.
Person 1: Helo all, whats up?
Language racist: Hello* (* = correction)
Person 2: Oh lol
Person 1: :(
Person 1: Youre such a language racist!
Language racist: You're*
Person 2: Hahahahahahaha
Person 1: .....