Is “Doing As You Please?” Good Advice?

Regarding English grammar, would you be well advised to “do as you please,” per the suggestion at left?

The fact that we have adopted words and phrases from other languages doesn’t mean that butchering the English language comes without a cost — if being accepted by educated people is at all important to you.

I told my children when they were young, “Other people can’t see your thoughts, but they can hear what you say and read what you write.  If you can’t speak or write well, they will infer that you can’t think well.  Don’t put yourself in that position.  People in other countries learn at least two or three, sometimes four or five languages.  You only need to get one down well.”