Is tongue wiggling and teasing flirting?

I am in a class in a relaxed setting where the counselor I think, is flirting with me. There are two other men, and myself in it. He teases me mercilessly, and will stick out his tongue and wiggle it at me. I'm quite certain he is flirting with me, but I'm married, and haven't flirted in some time. My marriage is done, and I'm enjoying the fun, how do I respond to him?
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This is just a short term class, we aren't in "counseling sessions" per se. I guess a better word would be instructor. He also calls me dear...
Is tongue wiggling and teasing flirting?
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