i don't think she's slut shaming b/c she's not going at Kanye for having a high number of sex partners or for dressing/behaving in a sexually provocative manner.

IMO the comment seems to anticipate the reader being familiar w/homophobia or maybe it anticipates the reader is homophobic or maybe she knows Kanye is homophobic and would prefer that info remain private. of course, the revelation of such a private, intimate act might also be somewhat devastating to Kanye even w/o the homophobia angle.

but anyway - the words i think you wanna troll with here are 'sex shaming' and 'homophobia'. among others.