True, sometimes even claimed to be a fallacy.
That's not the problem with it though, it's used as a "counterargument" to the other way around.
Let's use an example. Country A has killed a million people and country B has killed a thousand.
A: "B has killed a thousand people."
B: "A has killed a million people."
A: "Whataboutism."
The first claim is then usually "B didn't refute A's statement". How this even needs saying is a mystery, as it's quite obvious that B didn't say "A has killed a million people therefor I didn't kill any." The claim is then extended to 1. "B should refute A's statement" or 2. "B's statement is irrelevant." Both of these are quite questionable.
1. Why should A be unimpeded to make statements yet B be restricted to statements that imply the negation of A's statements?
1a. A was the first to get an accusation in. Then it's quite simple, just keep up an ever-changing barrage of accusations against the other side. I think they call this "the media." The advantage here is also that you don't actually require any evidence, you merely need to claim that you have it.
1b. A is inherently entitled to restrict the possible set of statements to be made by the other side. This could be that "American exceptionalism" thing. It's not very convincing.
2. B's statement would be irrelevant to what exactly? Let's split up A's statement into two equivalent ones. "A thousand people got killed. B did it." B's statement would certainly be relevant to the former, but not to the latter.
In conclusion, the problem has nothing to do with people getting killed but with who's doing it. A way to look at it could be a mudslinging contest where A, by claiming "whataboutism" as some sort of magical phrase, is simply complaining about mud coming back his way because either "my mud got in first" or "my mud is better."
Thank you for the more patient explanation.
But one must remember that it hasn't got to be a tit for tat. For example people killed by A vs people killed by B. The X in what about X can be anything. I think one of the original examples found on the web was "US build better cars" "What about lynching"
The posters in this thread all wanted to post "What about freedom of the press in Russia?" but after I said they would they couldn't. So they went to the next best thing: What about russian imperialism.

