Beware my answer is extremely practical and "Vulcan" so to speak. With that said...

My rule for this and other things is "will I remember/care about this in a couple of days?" If the answer is no -and for most, if not all online interactions, the answer is absolutely not- then why let it occupy your mind now if it's gonna leave it soon anyways. That's why I don't bother interacting with any response that is even mildly adversarial... why bother? Both you and the other person will have forgotten about it the day after tomorrow.

Like, try to remember an specific adversarial online interaction you had from like a month ago... it's probably hard to come up with a particular one. It's just a matter of looking at it from that future perspective in the present.

But maybe, even when trying to adopt that position, you are still overwhelmed with the feeling that you need to prove that you are right or the other person is wrong. In that case, remember two maxims for internet discussion:
1 - Everyone has already chosen their position, and is not changing it.
2 - There is no price for being right.
So, from a practical perspective, you will just be wasting your time trying to prove anything, since it won't change anyone's mind and you will not gain anything from it.

For me looking at it from these perspectives helps me to be "oh well, whatever"