My coworker said today that he loves to always see me teased and challenged, why?

Anonymous
We are in friendly/great work relationship. We work very well together. He teases me all time but not in a negative way. He never misses to compliment my personality. But lately he is starting to challenge me a lot. He keeps on saying that I am a strong tough women with a unique attitude. Yet he teases me sometimes in the apposite direction. I am confused, about how I should react. When he tease me in a negative way, I shut down and don’t respond to him. After he notices that I didn’t respond he says that I was just joking nothing personal.
My coworker said today that he loves to always see me teased and challenged, why?
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