That tweet doesn't include anything even close to "trans people shouldn't exist"

Just as I suspected, she said nothing like "Trans people shouldn't exist" - you simply made up that quote. You are clearly not arguing in good faith.

Unfortunately everyone that replied to you was unable to understand clear bigotry when it isn't stated in comically brazen form.

What's wrong with this tweet? This is a common view. Gender identity is a very extreme concept that erases sex as a protected characteristic.