"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.