"They look like monsters to you?"

[question?]

What do you think it means when Vincent says to Heather, "They look like monsters to you?"
If it's a joke as Vincent says, it's an odd one.

Here is a trancript of the exchange from Gamefaqs:

Vincent: Don’t stand there looking so smug.

Vincent: You’re the worst person in this room.

Vincent: You come here and enjoy spilling their
blood and listening to them cry out.

Vincent: You feel excited when you step on them,
snuffing out their lives.

Heather: Are you talking about the monsters?

Vincent: Monsters...?

Vincent: They look like monsters to you?

*Heather gasps.*

Vincent: Don’t worry, it’s just a joke.