Clubs on Wikisocion

[Expat]

club descriptions are part of classical socionics, but i'm at a loss for why people from similar clubs are likely to act similarly in any kind of significant way.

Assuming that the ego and id functions are strong, you may well be inclined to give preference to activities/interests related to those functions. However, they "act similarly" only in a superficial way, a sort of first impression.

it's probably best not to pay too much attention to it.

Sure.