I can't protect everyone from hearing things that hurt them. Because the simple truth is everyone has at one time or another said some thoughtless thing that could have hurt someone. What is important to realize is typically people aren't trying to hurt you. With anonymity people are generally just trying to say things to entertain an audience, and not everyone on the internet is the best entertainer in the world, so some of them suck at knowing their audience. What they think is funny or meaningless, another might find very hurtful. But people aren't evil, they are either mistaken or doing something they think is for the right reason, even if that reason is very selfish.
Everyone has to be willing to forgive others for this (except the moderators), because who knows when you'll find yourself selfish or thoughtless for a moment and make a similar mistake. Bullies are often the very people who get picked on and abused the worse, no different than those they target, but it's up to the person being abused to make the decision to be the better person, to forgive the bully out of pity and vow they never become a bully themselves. When a person feels weak or despairs, they need to realize they have the power to make the parts of the world they touch better.
People should think before they say things, but then people should also think before they react to what someone has said. Is what was said really worth feeling this bad over? Did the person saying it really want to hurt you? Do you really want to give someone trying the hurt you the satisfaction of succeeding?
I'm proud of anyone willing to open themselves up enough to perfect strangers to risk being hurt. That takes a lot of courage. Stay strong, and give others courage to do the same, I know you have it in you. But if it helps, know you'll never have to be that strong alone.