You're not required to celebrate any holiday or xyz day. Many do not participate in Thanksgiving, Christmas, Easter, Valentines, Sweetest Day, National Aviation Day, Senior Citizens Day, Woman's History Month, Black History Month, Trans Day of Visibility, Breast Cancer Awareness Month, Hispanic Heritage Month, National Library Workers Day, Parents Day, Mothers Day, Fathers Day, Halloween, Memorial Day, Cinco De Mayo, St Patrick's Day, Chinese New Year or Birthdays, etc.
There are hundreds of holidays or events that people commemorate that you and I probably haven't even heard of, or don't care about because it holds no significance for us. They can observe their special day and I can live my life at the same time. Jehovah's Witnesses don't participate in any of the national holidays but you and I can enjoy Christmas and Easter just fine.
I only know one Transwoman (that I know of) personally. If she celebrates this day, I have no clue. It doesn't affect my day either way. Most people who are upset about this had never heard of it and only knew to be mad about it after 15 years when a news agency, which should have had the intention to inform vs enrage, told them to. It only serves then point to amplify it.