[papln]

The metric (Jaccard distance) is symmetric. The assymmetry comes from ranking: JordanPeterson is more special-interest/intense-interest with a narrower more homogenous audience than the_donald, so it probably has more very-similar subreddits to it than the_donald does. the_donald would have more related reddits but with less perfect overlap in membership.

A broader base of people (about 1/4 to 1/2 of the voting age US public) is aware and supportive of Donald Trump and for a wide variety of reasons, and much more than half at at least aware of Donald Trump. Jordan Peterson has a much smaller following, who are interested in him for similar reasons to each other.

[friendlybus]

Makes sense, JP's reddit fanbase is quite small. One slice of his videos has been seen across all the edits and platforms 500million times. He has insane reach.