Transphobic Excommunication refers to a series of harassment campaigns within an otherwise progressive, leftist or queer-friendly space against a transgender person who has been found to have done something that steps out of line with the ideals of that community by using a series of tactics that would have otherwise been considered transphobic in order to humilate, exclude and hurt said transgender individual. It sometimes also comes in the form of dismissing the idea someone could be transgender because they have done something problematic.
The fallout can be a useful reminder to other transgender members who are getting ideas to say or do something that might be seen as offensive or hurtful. This often comes from the idea that freedom from bigotry within a progressive space is something that is earned rather than a right those of a marginalized identity are entitled to have. Many members of
transphobic excommunication mobs often feel they are in the right and think of their actions as examples of edgy progressive
vigilantism rather than acts of transphobia.