Don't try to get smart with me

At a toy factory

Boy: You look as if you're having a lot of fun, playing with all those toys.
Worker: I'm not playing with them; I'm working with them.
Boy: That's funny. I always thought toys were for playing with.
Worker: Don't try to get smart with me.
Boy: Oh, what do you mean?
Worker: To get smart, to make clever remarks.
Boy: Oh, I'm not making clever remarks. I just thought that toys were for playing with.
Worker: They are if you're a kid, but I'm not a kid. If I were a kid, I wouldn't be here.
Boy: But why are you here?
Worker: To make toys. We manufacture toys here. This is a toy factory.
Boy: Oh, a toy factory! Wow!

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1-What does "Don't try to get smart with me" mean?

2-What does "To get smart" mean?

Thank you