It's less about what you say and more about how you say it.

Sure as shooting, some woman will come along and read the above and swear up and down how creepy and frightening that was.

That's because she's reading it in her own inner tone she has assigned to men. Probably, for reason...it's what she's most familiar with.

You'll both just have to take my word for it. The guys actual time and actual demeanor was flirty and inviting. Not remotely threatening, aggressive, or overbearing in any way.

Now, could those same words have been delivered in a creepy way?

Absolutely.

If that flirtation with the coffee stirring had not happened oruor to that "that's what I like to see, yeeees", it would have thrown the whole thing off, been weird at best and downright creepy if the look had also been more aggressive or not softened with that genuine smile.

I can't speak for all women, of course, but for me....

What gets you in creep territory 90% of the time is

1) violating natural ethics around personal space.
2) choice of predatory body language, body mechanics, and what I'll refer to as body acoustics to mean using your body to make sound in various threatening ways or to draw attention to yourself.
3) Anything that makes the sexual validstion a forced one way conversation.

I had said before about how when women sexually validate, it's subtle and a private conversation. Another way to describe how it lands when catcalling tyoe men do it vs how women do it would be these two statements:

Option 1: "I am experiencing sexual desire and I'm demanding you attend me!"

Ugh, right?

Option 2: "You're beautiful and full of life. You inspire my desire and joy in life."

Awwww, right?

If you want reciprocation, whatever your actual words are, your actions and demeanor, all the things, should be saying that second one, not the first one.

Cause if you go with that first one, quite naturally, you're going to be viewed as a creep and you're getting the long side eye.