Reality is reality. A mental inability to perceive reality properly is mental illness.
We should have sympathy for people who have this disorder, not encourage them to double down on their illness. Shame on society for failing to offer healthcare to these mentally ill individuals. The Left is VERY uncaring on this issue.
(And note...we aren't talking about physically transgender people, we are talking about single sex people who don't perceive their sex correctly. You seem to want to blur the lines to justify your lack of compassion on this issue, but that is disingenuous. If you want to talk about the truly transgendered, those born with both sex organs, for example, that is another conversation entirely.)