[karmelapple]

What will be even more effective? Talk to that person, face-to-face if possible, who you are friends with, who is empathetic to you and your views.

As this article points out, online public posting is performative.

Like the management guidance that is unfortunately not at all practiced enough, "praise publicly, criticize privately."

If you're going to get into a situation where criticism is unavoidable, do it when the person's "punishment" of the criticism won't be public to be read forever and ever.

Plus, it's a lot harder to have zero empathy with someone whose eyes you are looking into, whose presence is right next to you. But an anonymous internet poster, or even identified internet poster who you won't see for months or years? A lot of people don't care about that person's feelings at all, and don't have the leaps of imagination that what they type might actually cause that person pain / tears / sadness / etc.