You basically said that you don't consider "old guys clubs" clans, and said that they might be a problem if they exclude others. Then you said that part of the of official rule on clans is "it's not illegal to have friends or play with them, but please don't exclude others." Wouldn't, by that definition, mean that any old guys club that excluded others also be a clan?
All chicken are birds, but not all birds are chicken.
