How should I respond to someone saying that they’re not gay after you have sent a response to their sexual hookup request made available to their followers who the majority happen that of The LGBTQ community of which they frequently interact with?

I would like to know how to answer  a Twitter influencer back privately after you have responded to a public tweet requesting a hookup encounter and t(he)ir response to you is that t(he)y are not gay! Bear in mind that this person’s has followers which are a majority of the LGBTQ community and some females. Plus throughout the person’s page are likes and retweets from other Twitter followers who are LGBTQ who by the way have responded publicly to the posted hookup tweet that t(he)y have either liked or responded back confirming interest. So again, how does one like myself who’s not only attractive but also in great shape respond to someone like this who’s so quick to respond with saying “I’m not gay” given the facts mentioned above regarding this person and especially when I have no interest in pursuing any type romantic involvement or relationship of any kind other than a hookup with this person? In other words why must the response every time to a proposed sexual behavior be answered “I’m not gay.” when that information regarding sexual orientation was asked whether t(he)y were or not? 

I would recommend saying, “Oh, that’s disappointing” either to yourself or directly to them, and move on. Don’t make too much of your disappointment, especially if you were looking for nothing more than a hookup. It’s just not worth it. Move on. /Edit/ I’ve had a quiet night to reflect on your question, and noticed I missed a significant detail: that they had made a sexual hookup request to an audience of LGBTQ folks, so their response is confusing. Are you wondering whether you need to publicly “out” this person as not gay or confront them privately? I would respond privately with something like: “I’m confused. You invited a hookup to a primarily gay audience, so I assumed you were gay.”