I'm not doing exegesis here, I don't even remember exactly what was said and I'm not going to do the legwork to dig up the quote verbatim. I'm just reporting what I took away from the exchange as a possible explanation to the OP's question.

My friends also tell me they don't know when I'm being serious about things or not as well because I also have a lot of fun with post-irony and meta-irony, but I also keep it relatively anodyne, as opposed to her aloof misanthropy.