Emos.

INT. LIVING ROOM

A MAN (DAD) IS SITTING IN THE LIVING ROOM. HIS DAUGHTER COMES IN DRESSED IN A STEREOTYPICAL EMO ATTIRE.

DAUGHTER
Hi dad I'm home.

DAD
What the hell is that you're wearing! You look like a bloody Satanist!

DAUGHTER
But dad...

DAD
No buts. I want you to go up to your room and change into some normal clothes now.

DAUGHTER
You're being such an asshole. Sarah gets to dress like this all the time. It's not fair!

DAD
Well that's a stupid reason to wear clothes like that just because Sarah does. If Sarah started cutting herself with a razor blade would you do that, hmm?

Ooh not such a fan. Long build up, to not kinda slack punch.

Yeah. I felt once I got to the end I didn't really do the punchline justice. I think had I have written it better though the punchline could have worked.

See where you wanted to go, but sounds more like a conversation than a sketch.

A good punch for me, would be a pace change, something like

"why cna't you dress more like your brother"

and he's dressed as a Nazi maybe.

To be honest that isn't a punchline, it is just something a typical Dad would say.

I didn't know what an Emo was until I visited my brother's family last weekend. When my niece explained her appearance by saying she was an Emo, I recall I made some remark about Rod Hull sticking his hand up her arse.

Well I quite liked it.

I think a twist of being told to dress like someone else who happens to be dressed outrageously would be a bit obvious.

For me, this looks like the start of a sketch about an emo. If you can add another joke and then a good punch, it would be cool.