The context of the following conversation is Alex is a professional athlete.  He bet some strangers that he could win a race and won.:
Alex says I'm feeling on top of the world right now after winning that race..
The friend responds But that race was just a local road race that was pretty insignificant for you..
Alex responds Yeah, but I bet some strangers I could win it..
The friend responds Did you tell them you're a professional athlete?.
Alex responds No, I didn't say anything about the fact that I'm a professional athlete..
The friend responds Then you tricked them, which was unethical of you..