"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.