Dealing with Stupid

Encountering stupidity is not unusual. Wherever you go, stupid acts are often observed. The act may be committed by a motorist, a sales clerk, or other person with whom you cross paths. The question is: How to deal with the 'stupid' factor? Finally, I am at peace with the realization that you can't deal with stupid. Therefore, I know longer attempt to understand stupidity, just to avoid it; and above all to endeavor not be guilty of it myself, like trying to correct it.