Is this a sign he's not that into me?

Ok I know I'm totally overthinking this but I have to ask anyway.
I sent a short, flirty text to a guy with a wink emoji at the end. He responded with just a smiley face with sunglasses emoji. Would you take that response as being not that interested or is that a normal response from a guy.
Is this a sign he's not that into me?
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