What does "you're such a girl" mean?

[Anonymous]

A guy I know and like. There's some times I think he likes me, then other times I think he's completely disinterested. He's really difficult to read.

We were at the same party. When we were in the same room together with one other guy friend I mentioned something about pajama parties being fun and he just smirked and said "you're such a girl". I'm really confused though. When a guy says that you're such a girl, is that meant as a good or bad thing? Is being a girl seen as a bad thing? or was he just teasing me for it?

[Distant]

Being a "girl" is referring to the stereotypical likes, interests and behaviors of a girl. Pink things, puppies, flowers, pajama parties, giggling about boys, not touching dirty things, etc. When someone says "You're such a girl", they're indicating that you're acting in such away. He's likely being playful. Though we cannot determine if it's a "good" or "bad" thing per se since we don't know his opinion on the subject.

[Anonymous]

Women are into clothes. Well, girlie women I should say...he probably just thinks you're girly..that's why he said "you're so girly" when you said "I think PAJAMA parties are fun". He was making a comment, that's all

[Hyrule]

If a guy says it to another guy it means being a coward/weak. If a guy say it to a girl it refers to the stereotypical image of a girlie girl.