She's bisexual, not a transvestite.

I was talking about the rumours of her being a man actually.

I believe that is called internet slander, not rumors.

She does have a penis though.

Nope, she's admitted to being a hermphrodite, and saying that she does have a penis.

...
Which is rather odd, considering most hermphrodites generally undergo process where if the child appears to be more girlish, they cut off the penis.

Why are people thumbing me down? She said so in an interview for christ sakes.

Because you particle, anyone who knows anything about Lady Gaga knows that she humors people who ask her about it. No she is not a hermaphrodite.
Here is two quotes from two different interviews regarding the penis issue. Notice that they contrast each other.
"Actually I have a really big, donkey dick."
"Me and my beautiful vagina are very offended by that question."

...So nobody wants to comment and correct me on it and instead thumbs me down like I'm supposed to read their minds?

That makes a lot more sense.

Doubt she would wear a strap-on while on stage or shooting videos.

You aren't getting any of that anyways, so the dick shouldn't bother you.