So your actual rule is, "people who are bad at reading subtle signals should never ask women out"?

The question is not "what should people do" but "what is being creepy about". Being creepy is quite often about not being good at understanding other people and acting badly as a result.

If you are bad at reading subtle sign the straightforward way is to learn to get better at it. For that it's helpful to do bodywork and train to perceive was your own body is doing. It's also helpful to go to workshops with people who give you honest and direct feedback.

Even textbook PUA has it's compliance tests to get information about whether a woman is likely to say 'yes'.