>Is it morally appropriate to get together a group of your friends and pressure someone to commit suicide on social media?
You are mistaking morality with legality. Morally its wrong, legally it shouldn't be.
>I read your moral position here as "if you are too frail to resist someone's words, you don't deserve protection from their verbal abuse with malicious intent".
Again, mistaking morality with legality. I'm not the OP, but that's my legal position, though it's not my moral position.
>Societies have a long-standing tradition of restricting individual behaviors for the collective good. Wishing that societies wouldn't this is hopeless, because it seems like every society that doesn't restrict individual behaviors to some degree ends up becoming a textbook example of how not run a society.
All coherent societies restrict individual behavior for the collective good. That doesn't mean that these restrictions should be dependent on entirely subjective things like thoughts and feelings. Minimal restrictions on individual behavior such as barring interpersonal violence or stealing property are more than ample for a society to run just fine without devolving into anarchy. I would argue we already have far too many legal restrictions on behavior, and we should be seeking to trim these restrictions away instead of pile more on and strip away what few freedoms we have left.