I believe I just read the same thread that your referring too, and it's such a shame as it happens far too often.
So many of us have limited resources to begin with, especially starting out with all the cost that are involved from therapy, clothing, make-up, wigs, hair removal, weight loss or gain, and so much more ...... We don't need to be spending ill-advised money on therapists who are going to use their personal prejudices and comments against our well-being, and not have our best interests in mind.
I know where I'm from - Minnesota in the USA, there is a State Board of Psychology where compliants can be filed and are used in assessing & renewing their yearly certifications & licenses for practicing therapy. My deranged soon-to-be ex-spouse tried to file a grievance many years back against a therapist I was seeing because she thought I was being mis-guided into believing she was directing me to have feelings of being transgender, rather than the initial point that I sought out her therapy on my own from the beginning because of my own gender dysphoria. The grievance was never file and logged as I blocked it.
I don't know if other states our countries have this option when it comes to licensing reviews and re-assessments for therapist based on specialties of care, but it might be worth looking into.