Why do you think you are entitled to make "objections" to other people's reality? If others wish to use different pronouns how does that even affect you?
And yes, I'm fully area that transgender-transsexual is an outdated term, btw- and non-binary people are different groups. But both groups are who they say they are, and nothing they do is in any way any sort of a threat to you.
It's not as though any possible good would come of rejecting anybody's personal, lived truth- none of us can know what anybody else's truth is, and none of us are entitled to question or disrespect it. Accepting that is just simple human decency.
BTW, I don't do fads...I just act out of respect for my fellow human beings. Why is that so hard to accept?