Yep. I ignore backhanded compliments. I'm pretty sure half the time I don't even realize it and don't care to when it's happening(I've been told by others this has happened) and that's great for me. For what happened to you which was a direct insult, I would be sort of shocked and would also ignore it. I mean, what do you say to that? I probably wouldn't go out of my way to be social or nice with that person anymore as well.I usually call people out on backhanded compliments, though in a somewhat humorous way.
What you posted is not a backhanded compliment though. It's a straight-up dig. I wouldn't even know what to say to that. Your friend isn't obligated to find you beautiful, but there is zero need to tell you something like that!