Mrs. Read and D.W. in “Unfinished Business”

Dora Winifred Read, what did you just say to me?!

Uh... Can I have a soda? Tibbles!

What are you doing?!

Uh, Arthur did it?

Well, D.W., you're off the hook this time, because you didn't know what you were saying. But I hope you know now that swear words are not appropriate, especially for 5-year-old children.

Why?

Because most people are offended by them. It's as simple as that.

But why? What do they mean?

I guess you could say they mean "I want to hurt your feelings". Good night, D.W.

Why didn't somebody tell me that in the first place?