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And what does it give? The person will continue to be insulted, but they won't see it? So everyone else will still read these insults, accusations, attacks, and so on. And without seeing any rebuttals, they might easily think that since the person isn't responding, it must all be justified.
1) Why is it that if someone ignores someone else, it means everyone else should ignore that person too?
And in general, what does "ignoring" mean as a whole? Doesn't it only concern two parties?
2) Hmm, if "others" know the offended person, their opinion about fairness will be formed anyway. And as for those who don't know them – why bother considering their opinion?
And about the kindergarten – we all came from there. Grown men in their 30s-40s are gathered, playing children's games until their wives take the computer away, and they still talk about "kindergarten"...
But seriously, one should strive for the better, not justify oneself with the worst.
I spend half my work time speaking in bureaucratic jargon, and the other half talking in criminal slang

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!