Reducing women or men to an expression, look or feeling, is the most shallow and child-like attitude you can have. Also why up to 90% of trans people have autism.
One thing is your feelings - the ideology starts when you decide you really ARE the reincarnation of Kurt Cobain and so you change pronouns. Gender doesn't override Sex.
The term 'Gender' was coined in 1966, and the new anti science activists look at the ancient past through the lens of their own brand new system and start calling people in history all kinds of BS like "non-binary" cos someone had typical women things in their graves.
It's both absurd and destructive to society. People should be WHO they want to be, not WHAT they want to be.