It's totally neutral and definitely not evil. If it were evil I'd be secretly feeding information to the other party, information that I'm sure Kirino-chan doesn't want Haruhi-chan to know, and vice versa..

[ Like that eroge on your phone, Kirino.

She's not actually threatening to do it, she's just giving an example...

..And yes she totally pulled out the honorifics there just to emphasize her point and potentially make it sound more evil, somehow.. ]