I don't think anyone here has a problem with you 'existing'. There's some wider unresolved arguments though that are difficult to discuss without being condemned as a bigot.
But what is being argued is that trans woman should not be permitted to exist as they do now and have done for decades. That seeing trans women as women is preposterous and that trans women should be prevented from using spaces which have provided dignity and safety for much of their lives to date. That trans people should be denied services if a victim of sexual violence, are very likely to be raped if they go to jail and should be prevented from taking part in sport and other activities in any meaningful way. That they should be outed as trans constantly and forced into dangerous and humiliating situations if they want to participate in society. Oh and you should listen to this guy who wants to try and cure trans people using methods known to be harmful.
And of course the people proposing this will say I don't want any of that and usually mutter something about third spaces, which don't exist, would do little to solve any of those problems anyway and which are never likely to exist in any meaningful way because trans women only represent one in a thousand of the population according to the recent census. If transphobia is escalated to the point of bathroom bills, then how likely is it that business owners and council tax payers will be happy to spend billions creating third spaces that will be empty for most of the time - at least until people start demanding all gender nonconforming and visibly LGBTQ people use the gender freak's toilet.
So what is being said is that I have no problem with trans people existing but only on terms that trans people themselves recognise would be unbearable with little realistic prospect for any alternatives to minimise the harm. And most trans people have experienced sexual violence and certainly harassment, have experienced that it can be dangerous to be suddenly outed, have experienced humiliation and abuse for being trans and often gender nonconforming prior to transition. Many trans people have experienced medical professionals denying their identity and seeking to test out their pet theories on trans people. They don't want to go to a gender clinic to be confronted by some inexperienced crank like Bell with his latest wacky take that it was the internet made them trans.
Then when trans people say fuck that, I couldn't exist in that world, that would make my life impossible, a society like that would mean trans people couldn't exist, they are accused of being hysterical and unreasonable by the very people proposing that's how they should live. People who aren't trans, have not thought through the implications, and in a lot of ways don't really have the tools to think through the implications in the way trans people do. And also frankly, for all their fake pity, don't really seem to care.