Your comments don't add up to my experiences. I'll post my IRL experiences and my IN TEXT experiences.
IRL: This often occurs to me after I've ALREADY BEEN GRINDING WITH A GIRL AND HAVE A BONER! My reaction to her gay comment is usually either 1) Why would I have a boner for you if I'm gay, or 2) Well then, I'll have to prove how straight I am to you tonight.
Like I said, IRL it's less likely to mean disinterest, perhaps the 2nd comment is what they're sometimes hoping for, as it's lead to hooking up once. But I think it must mean disinterest sometimes since I've been turned down on using 2 before.
IN TEXT: Seems more likely to mean disinterest. I'll post a conversations I had recently.
(This was on Blendr, the girl's pic only showed her body in a hand stand, but no face. Her body was HB9.)
(My profile pic shows face and body. I'm somewhere between an HB9 and HB10. I'm a semi-celebrity model, fyi.)
ME: You're cute! We should do hand stands together!
HER: Lol thank you!
ME: U do gymnastics???
HER: Growing up
ME: Woot! Gymnast girls are the hottest!
I train it everyday!
HER: Nice
I just did it as a hobby
May I see a pic
ME: But if I send, u gotta too!
(I already had a profile pic, but sent her another.)
ME: There! Youre turn.
HER: R u gay
ME: Hey, no avoiding the subject. U owe me a pic, fair's fair!
Her: I don't think ur straight
Bye
ME: Hmmm, y would i chat with u and ask for a pic if i was gay?
Oh i get it, youre lesbian and just masking the problem on me. Jerk.
SIMILAR CONVOS HAVE HAPPENED BEFORE, THAT WAS THE MOST BRUTAL THOUGH. Could it be some girls think I'm too good looking for them (this girl might have had an ugly face), or could it be I might really look faggotish lol and some girls don't like that (I'm actually very masculine and straight looking, but have feminine mannerisms, for example, I had a lollipop in my mouth in the pic I sent her haha).
"Awesome" conversation man. Both of you are so awkward. "Let's do hand stand together" wtf? If some girls say this to me, I forget about her already. And you appear so needy "You owe me a pic" really? The worst thing to say in online dating ever!
Girl asking if you're gay is NEVER bad thing. In fact, few things girls say are bad if you know how to play cool and turn it round. I used to get asked if I'm gay in strip clubs. I'm 6'0" 150lbs. Long hair and looks good in a kind of feminine way. And I'm usually very gentlemen aka always want to be friends first before getting dirty. But sometimes it goes so bad that on one occasion a stripper I just met (VERY hot and beautiful) put her hand on my crotch after asking me if I'm gay. I could tell she's very interested since we had quite a nice conversation earlier. I went "I see you got some very subtle seduction skills there." (This line works in a lot of situations when she's doing or asking something unusual and may signal interest. Say it in a ambivalent way and make it sound like it may be a sarcasm and it may be not. It makes you sound confident, and you can tell what she's thinking by her response.) She laughed, leaned into my arms, look up with her eyes full of love, (it's way too obvious now) and said "No just check to make sure you do have a cock." I know better than to be insulted, so I used one hand to play with her hair and brush her face lightly and said "Now you know I got one, what do you say?" She moved in closer, put her arms around my neck, pressed her body against mine, and whispered in my ear "I'd say we put it to some good use." I said "I'd say your seduction skills are wonderful." And you know the rest of the story.