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Basically, Frisk’s LV made them increasingly extreme in their hatred of them and a lot of (not all, a lot of) humans. Since monsters are pretty clear to them to be morally good, this hatred and violence doesn’t extend to them unless explicitly proven otherwise. Basically a wretch of vengeance. Also they are astutely aware of being effected (and thus inseparable) by Frisk, and hate it.
Yes this is edgy. If you don’t like that, it’s best that you leave. Also, toxic Cocinpow is there, but it’s not prevalent, at least for now. I am a Cocinpow shipper myself, so it in all likelihood might increase.
They also feel your (the player’s) existence. They don’t know you exist, but what they do know is that something is… strangely familiar with Frisk.