This happened to me last week, and it was really uncool. I feel you.
Mostly I just try to ignore it. If it gets out of hand I'd ignore the person being an arse. I agree with you; no ones FB status should be a forum for political taunting. Discussion, sure, but really I think its inappropriate.
"And politically correct is the worst term, not just because it’s dismissive, but because it narrows down the whole social justice spectrum to this idea that it’s about being polite instead of about dismantling the oppressive social structure of power.
Fun Fact: When you actively avoid being “PC,” you’re not being forward-thinking or unique. You’re buying into systems of oppression that have existed since before you were even born, and you’re keeping those systems in place."