Can you use two contractions in a row? For example, could you say, "Let's don't do that"?
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Technically, this isn't correct, because the auxiliary doesn't fit in that expression. However, this is a colloquial phrase that one does hear from time to time. Personally, it doesn't bother me.
The tone is little bit condescending, the way I've heard it used. A more neutral tone would be "It might be better not to do that" or "We would be better advised not to do that," etc.