An employee called me "boss", but I don't like it. How can I colloquially say that? [closed]

I'm a Coordinator at an English course in a small city in Brazil, and one of the teachers called me "boss" today. However, I don't appreciate being called that, therefore I'd like to tell him not to do so. I'd rather do it in a colloquial way, though. So, how can I say it?

Hey, man. There's no need for this "boss" thing, you know.

Come on, man. Don't "boss" me. There's no need for that.

Could you guys give me other examples of how you would say it with your own words?! I have no idea how to say that colloquially.

Language is a tool. Whether or not you have a hammer or a pillow, if you attack someone with it, the intent will do damage. In this instance, choosing the "best" words is not based on what you are trying to communicate, but on what you are trying to accomplish: to commune.

communication (n.) late 14c., ... from Latin communicationem ... "join, unite, participate in," literally "to make common," from communis

Successful communication joins people together: a colloquialism is no more or less powerful than other words.

EDIT The original poster commented that he is the boss of the employee and that he wants to keep the discussion "informal." Maybe I am viewing this entire question through the lens of communis, but if my perception is accurate, then the following may help.

Employee: Hey, boss!

Boss: Hey, Jason! Call me, "Lou." When you call me, "Boss," it puts an artificial divide between us. We work together, as a team, so "Lou" is perfect.

Employee: No problem. You're the boss, Lou.

Together: [laughing]

Something my dad would say when people called him boss (or sir, for that matter) was, "Don't call me boss, I work for a living. Please call me..." I always liked it because it's a bit funny while still getting your point across.

It would have been easier if you'd done it at the first instance; then something like "Hey, no need for that. '_____' is fine." or "'Boss'? Please! Just '_____'!" would have worked. Too late for that now, though, I guess. Best I can come up with at this point would be along the lines of "Uh… could you call me '_____' instead of 'boss'?"

On the other hand, I have to imagine a denizen of a small city in Brazil is not going to be nearly as sensitive to this formal/informal nuance you're seeking anyway. Just be cheerful when you say it and anything should be fine.