How do I politely tell my co-manager to take his job seriously 😒?

This co-manager and I had at it each other's throat aurguing. He used the stores money to buy people Starbucks he only buys it to younger woman only because he is desperate to be the cool manager instead of focusing on making goals sale and at a time the economy we can't afford to waste on ridiculous luxury. Anyway I told him well I don't need. I made a comment that I make my boyfriend his own coffee out of the blue my co-manager goes on singing that one line from one direction you are insecure don't know what for? 🧑‍🎤 So now a days a woman can't spoiled her men because apparently other guys call traditional woman insecure? Interesting.

How do I politely tell my co-manager to take his job seriously 😒?
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