Yes they can choose. We're talking about words here, just so we're clear. Words can be ignored, deflected, reused against bullies etc, there are tons of ways to protect ourselves from words and depression. Depression itself is not an excuse for suicide, it's only a cause of suicide. As long as people's life is not directly threatened, as long as people have a way to fight or run away from the situation somehow, they can choose. Suicide is an option only when you know you'll die soon no matter what you'll do. Otherwise, there're always other options.
Anyway.