"Gothic" is an adjective, not a noun. Therefore, a group of
people can not be "gothics". "Goths", perhaps (though not likely given how little
people know about the subject, especially
people who refer to themselves as "gothic"). Similarly, "emo" (which, by the way, has nothing to do with Gothic anything) is short for "emotional", which, also, is an adjective, not a noun. Calling people "gothics" or "emos" just makes you look like an uneducated jackass.