No, I wouldn't have to accept Buck because that would open the door to any man using the women's because Buck looks like a man
By the arguments on here you would, should he, in the very unlikely situation, choose to do so. The arguments against Zuzanna are that she is should not be permitted to use female spaces, no matter what she looks like or what surgery she has had . Buck Angel, who has not had no matter what he looks like, is a woman, following that line. And he has not had a phalloplasty.
Any transgender female who made themselves pass as a man can use the gents. They have no need to use the women's and any such use would be mischievous
They may well be mischievous but it still does not validate what your argument that they should not do so.