It's contrary to human nature to shrug off bullying. Even if you are strong, it changes and traumatizes you. Society should not rely on people growing unhealthy thick skin.
A lot of "ought" in what you're saying, but there's a stark reality that clashes with that ideology, and it's how little you can control others.
You shouldn't have to deal with people being assholes, so when they are you should let yourself get hurt? You shouldn't have to deal with drunk drivers, so you shouldn't wear your seatbelt?
> You shouldn't have to deal with drunk drivers, so you shouldn't wear your seatbelt?
No, but you're suggesting that we should all armor our cars. I'm suggesting that we should work to change the system so that instances drunk driving are dramatically decreased.
I would suggest armoring our cars if it were anything but absurdly impractical.
Getting to know yourself better, and understanding how bullying is a projection of others, and not related to who you are as a person is immensely practical.
Because a) it is the state of the world, and dealing with reality is important to living a healthy life, and b) controlling how others effect you is a tried and true way of maintaining happiness when you're not in control, which you rarely are in life.
There's a difference between someone rejecting you, and a bunch of anon/pseudonymous trolls piling on.