Certainly any comment could be phrased in a kind way. That's the thought behind Non Violent Communication from Marshal Rosenberg (may he rest in peace). Which, is great when the stakes are high and good faith abounds. But, online with anonymous users with dubious motives, the method falls apart.
Additionally not everyone subscribes to the "Prevent any and all possible harm." moral philosophy. I certainly don't. Prevent unnecessary bodily suffering, sure. But protect the possible feelings of a bold misguided fellow. Not so much in this context.
I'm aligned with you in principle but perhaps you could phrase this in a kinder way.