IMO, like many other things in life, you need to find a balance. In this case the balance in between 1)saying nothing or 2)getting diarrhea of the mouth.

This is also one of those issues where the local legal & political climate can influence what is appropriate.
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt