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Cut through the verbiage, and McClelland's argument is nothing more than an adult-age version of "It's our club, and you can't come in!"
Grownups don't object when other people want to joint their favorite activity. Quite the contrary, they normally extend advice or other help to get their co-participants up to speed. Most runners I've met fall into the latter category, thank goodness.
McClelland needs to go in his backyard, build a clubhouse out of castoff lumber, put a sign on the door that says "NO GIRLS/FAT WOMEN/AMATEUR RUNNERS ALLOWED", and contemplate his specialness. I'm sure that will make him happy.