What freedom are you referring to? We are all free to believe what we want, the problem is forcing everyone to believe the same thing.
The only 'freedom' in this case is the freedom to try and force (how ironic is that!) everyone else to accept as reality what he WANTS reality to be.
Why am I not FREE as well to consider this person - born a man, who has altered his body and/or hormones, and believes/wants himself to be/be considered by others a woman, - why am I not FREE to consider him to be EXACTLY THAT - a man, who has altered his body and/or hormones, and believes/wants himself to be/be considered by others a woman?
If you don't like it and are offended, why am I not FREE to offend you? There is nothing offensive or hateful about that, I just believe in objective reality.
As does everyone when they hit their/her/its/his thumb with a hammer.