This isn't politics... this is female-generated office drama.
Just let it slide off your back. If it becomes a constant, on-going thing then you may need to do something about it.
I imagine this guy is probably ugly or someone you would never be attracted to. Most likely if he looked like whatever your dream-guy looks like, you'd probably be posting today:
"Oh wow... this hot guy was teasing me at work... I'm apparently still very desirable"
But "Oh, noes... somebody said something mean to me at work, I need to make this a federal case because my feelings were hurt" is exactly a millennial thing.
As the Eagles so eloquently put it, Get over it!