I understand transgenderism, the ones I'm talking about, the ones who say there are more than 2 genders, are /not/ transgenders, they're "transtrenders". They claim that "gender is fluid", and "you can decide your own gender" (and that's what they're confusing with "personality), which completely goes against the transgender stance that they're born that way.
True transgenders don't just decide they were born into the wrong body, and they make every effort to transition into the opposite gender from which they were born, which implicitly means there are only two genders.
In fact, since leftists try to claim that "gender" and "sex" are different (they're not), I'm surprised they haven't moved to have the label "transgender" changed back to "transsexual". *Even though that's no longer in use, being considered a derogatory term).
And bad analogy. Combining black and white gives gray, which is a combination of the two original colors, but its function isn't changed, it still does the same thing, which is to change the color of whatever it's applied to.
Not to mention all three are technically not colors, they're all shades on the greyscale, and no matter how you mix in black or white, the resulting combination will be a mix of the two, it won't suddenly become an actual color.