Why is it easy to compliment someone you're not interested in?

I don't know that I'd call it flirting, but it's so easy to say something complimentary to a regular person than to compliment someone you like or are waiting to figure out.

For example, I was standing around waiting for something and a guy wearing a sweater with a giant knit "A" sweater came up to me. So I asked, "Does 'A' stand for Awesome or are you a Nathaniel Hawthorne fan?" We started talking and chuckling while waiting in line, he asked for my number, blah blah.

I know that if I'd liked the guy I would probably have just made the Scarlet Letter reference in a cute way and a ~60% chance of his getting my number or asking to connect on some app...

And the wrong guy will call... and the right guy won't... (though arguably a grown man wearing a knit sweater with a giant A on it isn't the right guy no matter how you splice things).

Why is it easy to compliment someone you're not interested in?
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