This is the start of generation z. They've never lived without the internet, they've grown up in an extremely safe world - and many now view words as violent. I do not know how we can stop this nonsense.
They are sheltered little snowflakes and they will be dealt with in a rough fashion in the real world. No one cares about your feelings. I don't care if you are black or gay or whatever.
Try again. Defending free speech doesn't mean we shouldn't care about others' feelings. It means that sometimes, hurt feelings are a price that need to be paid for freedom.