I can usually smell dishonesty in people. Sometimes it is expressed in overly syrupy greetings or facial expressions which betray the fact they are trying hard to maintain the facade. As we get older and with some luck our game face drops and we fall back on an honesty rooted in the fatigue of having had to keep ours up for so long. It is one of the advantages of aging.Having to keep up appearances is exhausting (as most trans people will attest to) and there is much relief when the baggages can finally be dropped.
I now try to associate with people who are more rooted in earnestness and who have no fear of the outside world. That vulnerability and honesty draws you to them and rewards you with more meaningful interactions.