As a girl, I’d imagine that’s sarcasm. Unless you got a real mean and judgy girl on your hands. But id say it’s a slight flirt to reference your bed .. how they’re extra pillows / blankets. Maybe was looking for you to say that it’s comfortable or that you like to be snuggly when I sleep. maybe with her …
A good test to do with people who make fun of you is make fun of them back, with the exact same energy, and see how they react. My bf makes fun of me playfully, and makes fun of himself and laughs along when I do it. When I return his energy, he shows that he can take his own jokes and therefore sees them as jokes. If you get someone who’s trying to manipulate or control you with these comments, they will often get mad when you do it back. Very telling.