There are thousands of problems in the world, and you, like all of us, are almost certainly doing absolutely nothing about the vast majority of them, even if you've picked a few that you do care about and are actively engaged in. Does it make sense for someone who has picked a different set of things than you to care about, to denounce you as an ignorant douchebag because you aren't fighting their fight?

If not, does it really make sense for you to call others, at the drop of a hat, ignorant douchebags for not fighting the battle that you've chosen to fight?