Well, this has become very polarised and I don't see either side changing their views!
I'm no expert and I certainly don't "hate" anybody.
I have two points/thoughts.
On sport - I do have an issue with biological males in women's sport, due to concerns of fairness and safety. To say transmen have competed in men's sport may be true, but it's not the same issue, because they don't have the same innate physical advantage that biological males have. That I imagine is why there are no male sportspeople arguing against the inclusion of transmen. Also because I suspect it happens a lot less. Yes, women can beat men (Billie Jean King/Bobby Riggs, for instance) but it's a lot less likely especially at a high level.
More generally - yes, there have always been "transsexual" people, but they used to be very very few, usually men who went to great lengths to become "female" via what used to be called sex change operations. Why are there now so very many, most of whom don't have any kind of surgery? You could argue it's because society is now more accepting of people being their true selves. But I struggle to believe that there are now so very many more people (including legions of young teenage girls) whose true selves are the opposite sex when there's no evidence of this being a major issue in the past. At my DD's school it seemed like every second person was trans or non-binary, and I strongly suspect most of them will not continue to be so in adult life, because there's so obviously an element of it being fashionable/high profile/attractive to confused young people who feel a bit different. (And it's a bit old hat just to be gay now, it seems.)
I'm not saying nobody is "genuinely" trans. But it has to be a lot less than currently seems to be the case, surely.