That really sucks :/. I'd suggest maybe playing some games with him & talking a bit before bringing up his post. If he gets aggressive about it, you could try sending him a couple of those links and just saying it's something for him to think about.
Some people are too afraid/angry about things they don't understand to listen to reason, but even if it goes badly, I don't think you should give up on a relationship with your dad. Some people take days or years to come around, but if you shoot him another message after things have cooled off, he'll probably realize that this argument isn't worth losing his son over.
Best wishes, lil_red! And remember: Those who mind don't matter and those who matter don't mind.