The claim of Whataboutism is heavily abused by everyone. It's only a fallacy of reasoning when used to completely distract from the argument and change the subject. Not when you're pointing out that the other side is not arguing in good faith, or the original claim has no merit. (say because they are arguing that something is rare and unbelievable and deserving of scrutiny, and you're saying it's not because here are some other common examples) In fact the abuse of the term itself should be some kind of fallacy.