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Let me revise my statement.
The term "mentally retarded" has a totally different meaning from the word "retarded".
I confirmed this with Google.

I work with retarded kids = I work with very...

Let me clarify.

You are retarded = You are a moron = You are very stupid.

They all mean "very low intelligence" and are offensive.
I think "retarded" and "moron" are stonger than "stupid".
...

I work with STUPID kids...