sigh.....you cannot "prove" things like sexism and racism, you can only make compelling inference. You must be smart enough to know that.
I dunno why we're doing this. Look, you keep talking to me in a tone of voice as if I am some mook or weirdo for asking for you to give a sense of your what kind of evidence you would want to see to compel you to change your mind. You keep speaking to me in a tone of voice as if I don't know how constructive dialogue works. I dunno who you think you are impressing by speaking in that manner, I assure you it is only yourself. These are very common standard expectations of constructive debate.
If you are unable to do so, then I judge you close minded and refuse to have the conversation with you. If you want to frame this conversation in your mind in a way as if you've "won" something by refusing to cooperate with basic questions about your position and its falsefiability, then ok, suit yourself I guess, I dunno why that appeals to you, but I guess it does.
If you think that makes me unreasonable or the mook in this conversation then so be it. But those are my terms, you seem unwilling or unable to meet them. I strongly suspect you don't want to elaborate on what would convince you because then I have a goal to hit, which is exactly what you don't want to give me. You would much rather I be trying to hit an invisible goal that you can move at will, and I understand why you want that, cause you have no interest in meaningfully discussing the topic, you just want to argue and feel smug. Which is fine, but that is not the game I am here to play.