Reasonable and smart honest people define "fairness" in different ways depending on their perspective. Many people who care deeply about "fairness" find themselves on opposite sides of this issue. It doesn't further the argument for either side to disparage those they disagree with.
In sporting and competitive activities "fairness" usually focuses on an even playing field for all participants.
On issues LGTBQ issues "fairness" usually focuses on tolerance and inclusion. Frequently tolerance and inclusion require an uneven playing field so that all may participate.
Can't do anything that might upset Orange Puddin' Pie's bestiest friend ever.