You beat them up, and protect them from smaller predators, as they're your punching bag and no one else's.
It didn't work for me, mine was younger enough that beating up his bullies would send me to prison. All I got to do was call him names, and that's only half the fun.
Which is ridiculous! As an oldest child, I know that my little brother didn't have any needs like my little sister or I did. Every few weeks, there'd be a door slam or a yelled, "WHY DOESN'T ANYONE PAY ATTENTION TO ME!?", which let us know he was still alive and obviously thriving if he had enough energy to make so much noise.
I don't know how to break this to you but its not 2016 anymore and Tumblr isn't as popular as it used to. Most of these are grown ass adults which absolutely atrocious reading comprehension.
This is also why Tumblr is tamer about social issues these days, all the pearl clutching teenagers who will cringe at their actions later in life are on Twitter.