It's because it's so easy it's boring. Check Powerline:

They Were Already Beneath Contempt...

...but now some Democrats have sunk lower. They are hinting that John Roberts is a homosexual because he was once photographed--more than thirty years ago--wearing plaid pants. You think I'm making this up?

Charmaine Yoest has the story. If you think that's contemptible, consider this: some on the Left have also suggested that Roberts' four year old son is "gay."

The direct challenge would be: show me a progressive that actually suggested this. Find me a blog that discusses the possibility of Justice Roberts being gay, as opposed to discussing right-wing blogs accusing progressives of such.

And I swear, if you point at a damn comedienne I will slap you.