Being offended over things is a fashion now, if you don't do it, you're lame.
I am lame.

People can identify themselves any way they want, but that won't change them. Yet, the very fact, that they're trying to differ stems from them being unable to accept themselves as the beings they were before stating what their identity is.

In countries, where there's poverty, people never have the time and energy to think about them being Apache helicopters in reality, and trying to force others into calling them missile/missiles. This is a trend of countries
where people have way too much spare time.

Fundamentally, these people would just like to feel being accepted, being important, being respected, and just like kids do things they are not allowed to do, these people are showing their need for attention and care using this new hobby of theirs.

You can get offended over this, or you can not, it's up to you. I welcome everyone regardless of identity, race, age or gender, if those are in the boundaries of sanity. If you believe you are a bottle of milk, I would like to know how you realized that. :D