Well, I hate to use this analogy, but at the risk of being called a homophobe, here goes.
I heard a quote once that, "The more you assert that someone of your gender 'must be GAY!' the higher the chance is that you're HOPING they're gay--for one reason or another."
There could be a number of reasons why one would want to paint a member of their gender as a homosexual. One is that said malicer is, him/herself, harboring secret homosexual desires, and this is the only way he/she can appease them without letting anyone know.
Another is that said person fears that he/she might be gay or that others might think he/she is gay, and wants to take the speculation off of him/herself--and does so by picking on another person. When I was a kid, this was a common characteristic of what we then called schoolyard bullies: projecting their insecurities and frustrations on other kids in the form of demeaning insults and/or physical blows.
The schoolyard bully, in its adult form, is better known as a member of the Democratic Party. Terry McAuliffe, et. al. know that their worldview has many eerie parallels with that of the Fascist worldview (once thought to have been vanquished), and out of fear that the good voters of Middle America will discover this, they quickly rush to paint conservatives and Republicans as Nazis and Fascists.
It's funny to watch, and it may win them a few elections here and there, but goodness knows how long they can keep this up before the truth comes out.