ProudToBe was a movement created to show that people don't care what other people think

Was it? Because generally when one doesn't care what other people think, they don't aspire to be youtube social commentators.

Gay discrimination is still a problem these days

Of course it is. My comments, however, are not really about homosexuals though. Its about, for example, the person that was born a female, and has decided to "identify" as a male.

If everyone were to stipulate to the rather juvinile position that "Gender is a construct", and then further agree that constructs are somehow inherently bad, why then is not "Having female genitalia" and "identifying as a male" a construct?

Furthermore, to sexually identify as a male while being female, would mean to either change certain inherencies in yourself, or to acknowledge existing inherencies that aren't typically female. Except we know that sex is not necessitated upon roles, behaviors, or thought processes. Sex is determined by genitalia. So the one thing that actually makes one male, a penis, is absent. The only way to actually sexually identify as a male, is to either have a penis, or stipulate to following social constructs that are typically male. The latter, of course, is just fine. Nobody should be stopped from doing that, but it also means stipulating that gender is, in fact, not actually anywhere near as fluid as the tumblr scientists would like everyone to believe.

Again, let me say this, none of this is WRONG for a person to do. They can do whatever they want. But it's just silly and massively trendy. Saying CIS around most people already gets you an eyeroll, considering the entirety of the non-CIS is .03 percent of the population, and you only ever hear CIS being used derogatorily now.