'Whataboutery' has an interesting derivation.
It's another example of the Ulsterisation of the mood music of Scottish life. It used to be said, you cannot debate using your opponent's language, if you expect to win.
Go back in excess of two decades and one of the first websites to gain prominence was, 'Slugger O'Toole'. It was a site for discussion around Irish politics. Of course, the Troubles in Northern Ireland featured heavily. Threads were guillotined to stop the habitual, "ah but you did this" continuum. If you could not bring something new to the discussion, it was called a 'whataboutery' foul. Supposedly, remembering or reminding of IRA atrocities did not advance the discussion to satisfactory conclusion.
The usual suspects brought it into Scots journalism, Kevin McKenna, Spiers, Spence, ...... etc. Stuart Cosgrove was it's first and most frequent user; even presently, he will label something he does not want to discuss, as whataboutery.