Signs a sarcastic guy likes you?

Hard to tell when they're always... SARCASTICCCCC. I was at work and a regular customer comes in and long story short, jokingly asked me to be their fishing date and I said, ".. Naaaah, I'm good" and then he laughed and left. Then my crush goes, "Well that was KIND of him. 😏😂" in a very sarcastic sounding voice and I'm like "No it was not KIND". He's never commented like that before, and he obviously seems to hate it when I have to help male customers, especially ones closer to our age. This was just one example of how he is, but are there other things sarcastic people say or do if they have a crush on you?
Signs a sarcastic guy likes you?
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