What do you do when someone asks you to share something on social media and you disagree?

So you message back to say you cannot share it, the idea is wrong, it’s based on fake news. You attempt to say no politely, and point out reasons why you can’t agree.

The person messages back and after some patronising thoughts, swears at you.

You come back with more information from a reliable source. Another abusive reply.

I’ve known this person for several years. I have never been spoken to in that way by the person before. My thoughts are they must strongly believe what they are saying. They must care or they wouldn’t share. But what they are asking me to pass on makes no sense. After another exchange where they were rude and patronising again…

I blocked them.