Do guys tease you only when they like you?

I have this strange situation with my coworker. He teases me (other too but a bit), he goes to eat with me, he shows me middle finger... and he wants to sit close to me in meetings. Also, he wants me to lead him everywhere since he's affraid. So strange.

I do not know how to react but somehow I think that he's giving me mixed signals on purpose.
Do guys tease you only when they like you?
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