Don't have too much fun?

Anonymous
I am new to US and I don't understand many of the phrases you are using.. So this Friday my male colleague wished me Happy Weekend and I wished him back. Then he stopped me and said don't have too much fun during weekend. What does that phrase mean? Sorry in advance if this question looks stupid to you. I was not sure what to reply for this. So I just smiled. What does this phrase mean and how should I respond o this. Thank you
Don't have too much fun?
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