It's a fashion thing, the latest insult for the (mainly american) right wingers against anyone that doesn't agree with them or their esteemed leaders. It's also a way for them to explain away someone they don't agree with or like:
"liberal, that's it he's/she's a liberal. I don't have to listen to his/her viewpoint I can safely ignore them... phew"
They'll have a new favourite word/phrase next year, something like:
"progressive wimps!"
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