When people started taking these "mouth-breathing troglodytes on Tumblr" serious enough to do something to appease them, like with campaigns to stop men who still possess their external genitals to sit comfortably on public transport.
The old man yelling obscenities and shaking his fist at you at the bus station may be a funny dude. You may laugh at his behaviour. But if one day, he were to become a bodybuilder who CAN accomplish something, his lunacy is no longer silly and fun. That's the point we're at. Tumblr (and the origin of the mindset that bred Tumblr) is affecting the real world, and still people go "Wow, just ignore it, dudes. They don't have real power anyway!".