From what I've seen, in context, a whataboutism is concerned about the argument of moral authority and precedent from the person accusing a AES or progressive of something bad...
Here's some rules:
Apply it when it relates to the precedent of incidents that seem exceptionally bad, when committed by Actually-Existing-Socialist countries, but are ignored, if not justified in Capitalist ones... they could be explained as historical thinking of the time or justified under circumstances
For example: https://hexbear.net/post/2329752 (Homosexuality laws compared between historical Soviet Union and the West, lemmygrad meme)
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However, don't use irrelevant ones to detract from past mistakes, they make you look daft and aloof
I'll explain more later on...
IRL sure, but online headass libs? "We can never stop dunking"
A lot of people get radicalized (at least in part) from what they read on the internet. Dunks can be an effective way to get a point across, but they probably work best when complimented with more straightforward arguments.
thank you for your service in the posting wars o7