The cause is entirely relativistic and unique to each transgender person.
Cool. Thank you for confirming that there is a cause. As you might have noted I already said the cause can be complicated. See an object on the floor. There might have been a million ways it could have gotten there, there still was a single way it got there for a given object. A --> B.
Transgender isn’t a property of a person it is a description of their relationship with the gender society assigned them.
Doesn't change what I said even slightly. Something only has a particular length due to it's relationship with the standard unit of length. Got a 3 meters long thing? It is related by multiplication and "3" with the meter. Philosophy got this totally ass backwards when it tried to view relationships as distinct from properties. As if there could somehow be movement without matter. And breaks emergence.
Besides which even if being LGBT was completely relational instead of intrinsic it wouldn't mean much. The parent child relationship is relational and it could be studied just fine.