People on Facebook can be such hard work.

I posted an answer to a question in a group along the lines of "I think "A" is probably right, but if it turns out to be "B" then this will be the outcome".

Got a reply from someone else: "wrong".

After multiple comments to prompt him to actually state what was wrong and to provide any sort of support for his statements (the best he could do was state "it's obvious" that demonstrably untrue fact) I have gotten to a "well we just have different views" post. I give up. Why people feel the need to correct other's opinions and confidently state things as fact when they don't really know what they are talking about is beyond me.