How to respond humorously when someone says I’m treating you to a meal and you pay the bill. .

You can say, I pay the bill and you pay.

You can also say that for such a big boss like you, you still want me to pay. It doesn't match your status.

You can also say, you pay for me first, and I will return the money to you in a few days.

You can also say, please give me your wallet and I will pay for it.

I hope you can adopt it.