You get facts from measuring devices, not people. And even then, when you read the number on the display, or try to figure out if the device is functioning correctly, the facts instantly become opinion again. If it helps you, prefix everything that everyone ever says from now on with "It is my opinion that..." e.g. "it is my opinion that it is 6 o'clock."

The "that's just your opinion, man" thing is the only thing I'd like to see as a universally ban-worthy offense on the internet. It's an entirely empty statement that can be made about anyone who said anything, is always a bitter defense against somebody who took the risk of putting themself out there, and shouldn't be seen as anything but a troll.

And I'm fully aware that this is my opinion, which is why I said it and not someone else.