Mike Sutton is a meta-skeptic. He debunks skeptics who use myths to debunk myths.
From a FiveThirtyEight article by Daniel Engber:
In 2014, a Norwegian anthropologist named Ole Bjorn Rekdal published an examination of how the decimal-point myth had propagated through the academic literature. He found that bad citations were the vector. Instead of looking for its source, those who told the story merely plagiarized a solid-sounding reference: "(Hamblin, BMJ, 1981)." Or they cited someone in between — someone who, in turn, had cited Hamblin. This loose behavior, Rekdal wrote, made the transposed decimal point into something like an "academic urban legend," its nested sourcing more or less equivalent to the familiar "friend of a friend" of schoolyard mythology.
Emerging from the rabbit hole, Sutton began to puzzle over what he'd found. This wasn't just any sort of myth, he decided, but something he would term a "supermyth": A story concocted by respected scholars and then credulously disseminated in order to promote skeptical thinking and "to help us overcome our tendency towards credulous bias." The convolution of this scenario inspired him to look for more examples. "I'm rather a sucker for such complexity," he told me.
I don't know any meta-meta-skeptics, but I imagine we'll meet some in the comments.