First off, this is not a cartoon about hatred, but rather about promoting something positive and useful. Identity is who we feel we are inside interacting with other people's view of who we are. Identity in this sense is a negotiation with others. If this were not so, then none of our actions would have any meaning. Everything we do and say matters in the context of other people, our significance as a person is intertwined with how those around us respond to it. If we demand the ability to define ourselves, demand the right to tell other people how they should define us, that social negotiation breaks down. If any of us want to get along with anybody, there must be negotiation, but to say "you better call me X or you're scum", for example, one is making a demand. This behaviour does not foster understanding, it fosters resentment. Of course, we as individuals have the right to think about ourselves anything we want, as anything we want, but we cannot demand that everybody else get in line and follow it like it's law. Not unless chaos, unrest and loneliness is what you are aiming for.
Basically, it is one thing to think of yourself however you like, which is your business and your right. However, if you demand that other people "validate" your identity, see it as unquestionable, you are making a demand to have no accountability, no responsibility. If others are responsible for validating our existence, without which we crumble, we are building our identities on something weak and arbitrary. Delusions require constant reinforcement and upkeep, I don't like seeing people suffer when their self-perception constantly clashes with the outside world. Validate yourself, you don't need other people to hold you up, you can hold up yourself. Be who you are and let the world respond, rather than wanting the world to bend to you.