well duh, because the only people who read manga that take this topic seriously are people who are open to taking it seriously to begin with
Well, duh, but i assume that all those self righteous people that are so outspoken here, with terminologies like "eggs", "cis", and "pheromones" (and probably many more words that have yet to make an appearance, if not here, then somewhere else), are pretty serious about their cultural captive mental illness. So why not go somewhere, where the whole "gender" thing is treated seriously? Those places aren't that hard to find, with sites like MU.
Way to appropriate language by the way - in my days "egg" was usually something that bird shat out, "cis" referred mainly to double bound geometric isomerism, and "pheromones" were chemicals produced by animals to send information to other animals (that one probably stayed the same, is just person misused it).