Someone who plays soccer or basketball a few times a month might say "I play some pick-up soccer/basketball" but they don't usually go around telling people "I'm a basketball player" or "I'm a soccer player." Yet in running, if you read places like r/running, it's all about "If you have ever gone for a run, you're a runner!"
Why is there such a big difference in the respect given to serious soccer/basketball players vs. players who just play occasionally for fun, vs. serious runners vs. people who occasionally jog?