In that particular case it was "two biological sexes exist" which caused a controversy.
People can live their lives however they want as long as it makes them happy, who am I to judge, it doesn't bother me at all. What does bother me is that as I said, freedom to express your opinion (unless it obviously fully complies with the "norm") is severely limited nowadays. Anything you say can get you fired from the job or become a target of cancel culture. Someone saying "there are only 2 genders", "transgender men should not be allowed to compete in women sport and vice-versa", or simply thinking that some of those infinite amount of genders are ridiculous (mirrorgender, duragender, condigender etc) should not cause a controversy because it's an opinion after all, just as "right" as someone who thinks otherwise. Anyway, don't want to go offtopic any further.