How to respond to a guy's playful teasing without being thought of as interested?

Rou123
It's now become a pretty much overwhelming problem for me.
If a guy (not particularly one) playfully teases me and I do the same back, he thinks I'm interested and/or flirting (even if I'm not that much). If I just pretend I didn't hear that, he would either think I didn't mean it or that I'm rude, which is true in this case. If I look at him with a poker face or something like this, he gets kind of upset.

So I'm really confused. What can I do here? ☹️
How to respond to a guy's playful teasing without being thought of as interested?
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