I've been told by a close (female) friend that I'm constantly criticizing her and that she's feeling negatively around me. She says that I'm a funny person and she enjoys spending time with me, but that I often make her feel negative, too.

I'm trying to do it in a playful manner, but with a true core. It basically always boils down to me showing her that she is not the girl she believes she is. For example when she's promising to do stuff but then actually never do it or when she tells me that she can't believe how most girls behave I can't help myself, but tell her an example of her own "bad" behaviour.

Am I just a stupid buzzkill and should talk to no one about any real issues no matter how close they are to me or is she just projecting her negative feelings about her own mistakes on me because I'm the one pointing it out?