你这个妖怪 妖怪怎么了
“You demon! What's wrong with being a demon?”
THE DIALOGUE REEL
你躺的地方 就是我养螺的螺池
“You're lying in the pool where I keep my river snails.”
你 这个 妖怪 妖怪怎么了
“You demon! What's wrong with being a demon?”
我是妖怪
“I am a demon,”
“So what if I am a monster? You can't do anything about it.”
Repeating the opponent's insult followed by '怎么了' is a common dramatic rhetorical tactic to strip the insult of its power and counterattack.
LEARNING CHUNKS & PARTICLES
what's wrong with being a monster / so what if I am a monster
The pattern '[Noun] 怎么了' is standard spoken pushback meaning 'so what if that's the case?'
Forms the rhetorical question marker in '怎么了' to challenge the speaker's objection.