Why would people be embarrassed there is only one real choice with Corbyn leading the labour party.
I am not embarrassed to say I have voted Tory but also I do not see the point in trying to wind up my friend's and family by posting every two minutes about nasty labour etc.
Several left-leaning people on NSC have explained the phenomenon by stating that Tory voters are either ashamed or embarrassed to say as much. I was just saving them the bother of saying it again.
I like the word Embarrashamed though. I shall use it more.