And that is why you shouldn't generalise about anybody. I'm 73, I use FB but certainly don't get all white supremacist or nationalist or racist on there. I do call those out if they appear on my page but that is about it.
The whole Facebook phenomena is dangerous, it has elevated the barroom braggart or barrack room lawyer to a wider audience and has serious consequences politically throughout the world.
Blame Brexit on it, blame Trump on it. The unfortunate thing is that if you do not call those bigots out no matter what age they will be forever bullying.
It is not a boomer only thing.