Why do women find so many things and behaviors “creepy”? Is there a biological reason for this?

If the guy is handsome it stops being 'creepy'

if the guy is handsome she will put up with him being creepy more then if they weren't. its still a bad thing

Yeah, it's this, thread can end. Notice if you call a girl a creep or creepy, your brain finds something strange with it. That's the conditioning.

you are unattractive to them
stop being unattractive

Their perspective is to meet the status quo. In their mind, whatever that is, is what they deem "normal". Anything that varies from what their "ideals" are is considered repulsive.
Fuck 'em, she is just a dumb uneducated bitch if she says this shit.

"Creepy" means "showing way too much interest".
Try softening your escalation by including shows of disinterest. (But continue escalating).
I know it doesn't make logical sense but it does make emotional sense.

Women instinctively avoid inbreeding and their sanity revolves around respecting their instincts to do so.
If you want 'genetic purity' and are attracted to a woman she will sense it and you'll creep her out.

showing too much interest shows at some level desperation/want which lowers your sexual market value.

A show of disinterest tells a woman that you don't need her which signals greater value and continuing escalation increases familiarity with the girl. So its easy to progress in the interaction.

Sure it doesn't make sense when you say it like that but it makes total sense when you break down the interaction into the component parts.

I agree with you.
Guys, that girls see as creepy are often not very attractive people who always chase girls way above their league, despite them showing no interest. Also they often they have some weird character traits.
I am not saying dont chase after woman, after all who cares if some girl thinks you are creepy. But a ugly guy who is very social wont be called creepy ever, if he doesnt do things like that.

How to be creepy:
Approach a girl
Be awkward

How not to be creepy:
Approach a girl
Be awkward
Have lots of money
Or
Approach a girl
Be awkward
Be fit
Or
Approach a girl
Make her laugh
have confidence

If you're not creepy and she's still not interested, just smile and walk away. Chat up a girl you're not interested in while the first girl can see you and she will either be interested or she's not there to hook up.