What if you were alone? At SB, but alone - you and the guy. A deserted SB with just you and the guy? Still unpleasant?

I can see how this situation can be embarrassing in the presence of other patrons at SB - but not when you are alone. I had a few guys come to me when I was about 20 or so to say: "Look, I want nothing from you so don't take me wrong - I just wanted to tell you that your breasts are gorgeous."

I liked that and still remember it. But they prefaced the compliment with "Look, I want nothing from you."
And that was key. They did a very good job with such a preface. They realized that I might have otherwise considered them creepy, and preempted such a reaction in me.

I chatted with them for a couple minutes each and we parted ways.

I have not retained their faces, though. So the memory is superficial (normally I retain faces very well), but still positive.