"Hint: You don't need to be a Creationist to see the evidence of a global flood."
Actually, you really do. The global flood is very crucial to the creationist model of Earth's history. They NEED the flood, so they see the flood. Those without a vested interest in the flood don't seen any such evidence.
"This is basically antisemitism against any belief."
No. Bigotry is an irrational stance taken against all evidence. Asking for your evidence for the flood is not bigotry. IF you had any, and offered it, and we still rejected it, then maybe our reason for rejecting it might be based on bigotry.
But since you don't have evidence, we don't see that in our rejection....
"Secular people see the evidence of a global flood themselves, but several don't want to believe it's true just because it is written in the bible."
Uh huh... That's why secular historians say Ancient Egypt never existed. it's mentioned in the Bible, and no one likes that, so we just made it mythical like Atlantis. Sure. That's how history works. And Rome never occupied Israel, same reason.