or it is so vague as to lose all meaning- someone with bi-polar disorder is non-neurotypical, but is no more likely to have made these than anyone else.

Not actually true (in the specific example, although I support your general objection about terminology misuse). In a hypo-manic phase someone is more likely to get caught up with the kinda-clever notion of making Hanson memes and get carried away dumping all his ideas, exercising less judgement and restraint than he otherwise would. (Of course some time later they would later be able to look at their work and see why it isn't funny and delete it. They are also more likely than average to come up with a whole bunch of awesome memes.)