(Your Opinion) what makes someone emo/goth/punk etc?

     Id say its the music they listen to AND the way they present themselves. But that's more so for goth. 

    IF we r talking abt punk, its more so the political views (even tho all the subcultures u listed have something to do with that ykwim)

The biggest two factors are the music and political ideologies. you don't belong in any alternative subcultures if you're racist, homophobic, etc. or if you don't listen to the music associated with it. Fashion is not a deciding factor and is mostly used for self-expression from those in the scene. It's a lifestyle, not just a fashion trend. 

For punk, it's mostly political values, for goth it's mainly music, but also how you present yourself (though I've been a goth for a while and I don't dress like it) and for emo it's also just music. There's this belief that goth or new wave has a political stem, when it was made as an offshoot of the apolitical side of postpunk.

music and political ideologies, at least for punk. 

for emo, from what ive heard its mostly music, and for goth it tends to be "just listen to the music" with a hint of appearance hidden in there LOL

also someone with shitty ideologies probably isnt gonna fit into any alternative subculture very well regardless of how much bauhaus they listen to LMAO