It is normal, much in the same way Autism is.
And autism is a mental disorder
To name a few other mental disorders...
(The purpose is down in my post)
-Depression
-Anxiety disorders(such as generalized anxiety disorders social anxiety disorders, panic disorders, and phobias)
-Obsessive-compulsive disorder (OCD)
-Bipolar disorder
-Schizophrenia
Does it include transgender, I don't know because that has became political and political correctness is at play there.
All these people carry extra things to deal with mentally and/or physically but should not be looked down upon as inferior, mistreated, ridiculed, stigmatized, or anything else.
Political correctness, avoidance, offensiveness, acceptance, etc makes it hard to talk about many of these things.
I'm not offended and accept people who are transgender however it seems to offend them when I say I don't agree. Imagine that.
But in my opinion to tell someone they are transphobic, homophobic, etc because they don't agree is pretty ignorant. A person can disagree something without thinking it is horrible or disliking people who are that way.
Also I am a born living male. I don't need a label of cismale.
When people/conditions strayed from male/female, it all got labeled. So it seems in turn everyone should have a/be labeled to make it fair/politically correct. I have a lable, its male,, No prefix needed.