Likewise, if someone suspects someone of bias, I don't think it's unimportant to ask them if they hold consistent positions. If a Trump supporter is talking about how Biden should be impeached for something Trump did, I don't think it's "whatboutism" to ask if they would hold the same standard to Trump (or vice versa). There's a big difference between being concerned about something because of an underlying moral principal, and being concerned about something because of a specific bias against one of the groups involved. This used to be considered an important distinction, but now people act as if we shouldn't even talk about it.
[1] https://en.wikipedia.org/wiki/American_Service-Members%27_Pr...