Yes, consider the source and also perhaps consider why she was a friend on FB as well.
Not everyone in this world is nice and kind. Heck, I'm not nice and kind all the time, especially to people who are bullies. But along the way, I have learnt to have some control over my own environment and limit my exposure to the jerks. And not take everything so personally. After all, if someone kept on at me about my disgusting green hair when I know mine is brown, who is the nutjob? And I always try to remember, it's not my job to make them see My Truth. As long as I know what that is, then all's well.
As (almost) always, it's a boundary issue, I think.