When all they've got is ... "Raaaaaaacist!"
They're not trying to argue with you at this time. They're trying to shut you up.
It must be so frustrating for them that it isn't working anymore.
I went to see 2016 a couple of weekends ago. I had read Dinesh D'Souza's book, "The Roots of Obama's Rage" -- upon which the film was based, so there were no surprises there.
It was very well put together. Dinesh narrates it, and comes off as his amiable, even-headed, thoughtful self.
Go see it, if at all possible.
And try to bring a friend or two.