See, the problem is that in this case you weren't refering to one person. You didn't say: "This woman is a bislut". You also didn't specify the subset of bisexuals you were targeting. You didn't say "These bisexual women who are homophobic towards lesbians etc etc". So that examples you gave don't apply.

The problem is that you don't seem to understand that using that slur in a generic way (like you did) can be misunderstood. Just like calling gay people "queer". There are people in our community that say we should not be offended with queer and that we should accept it as such and we are often referred to as queer. Do many of us here want that? No. Do many people find queer offensive? Yes. Yet you're doing the exact same thing as those TQ+ people calling us queers, saying our reasoning is "stupid" and that we shouldn't get "triggered".

Besides, it's rude to call ANY woman a slut. It's degrading for women.