So, I was having a minor discussion with someone on tumblr about a series we both follow. For context, the series is a manga about kids training to become superheros. Anyway, the OP was complaining about how the girls in the series don't seem to be as muscular as the boys, and I chimed in by saying that its harder for women to become visibly muscular like men, but that a lack of muscle doesn't mean that a woman isn't physically fit. Another person chimed in and said that I was sexists and that this line of thinking was a lie.

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Now I initially wrote off the other person as being overly sensitive, but I later realized that I could've been mistaken because I don't have a lot of knowledge in this field. I found some articles that supported my statement, but I wasn't sure if they were reliable or not. Even if my statement about women and muscle gain was correct, is it still sexists to say something like that?