no blondes are not dumb. people who happen to be blonde may make dumb decisions from time to time, but that is a reality of life for people of all hair color (including chemically applied) and bald people as well.
to give in to the assumption that a physical characteristic determines your ability in this life is to forward the very stereotypes that you are trying to overcome.
if you do something that is stupid, 'fess up: "That was stupid" and MOVE ON.
Don't use derogatory phrases like 'blonde moment' because they are not true! Everyone has 'moments' of less than quality.
Learn to separate your SELF from your packaging.
I know intelligent people of every hair color and scalp color. I likewise know people who have poor track records in decision making who fit the same physical criteria.
NEVER let someone else's prejudice determine how you feel about YOURSELF!
YOU ARE AS SMART AND INTELLIGENT AND BRIGHT as the decisions you make.
Learn to analyze the 'down the road' possibilities for the decisions you make.
Be willing to say 'I need some time on that' before committing yourself to a course of action that could brand you as a 'dumb blonde'.
And when people call you that, look them dead in the eye and tell them,
"I MAY BE BLONDE, BUT I AM NOT DUMB.
HOWEVER, THE SAME CANNOT BE SAID OF PEOPLE WHO JUDGE OTHERS BASED UPON HAIR COLORING OR ANY OTHER PHYSICAL CHARACTERISTIC.
I CAN LEARN TO MAKE BETTER CHOICES BUT ARE YOU WILLING LEARN TO OVERCOME YOUR PREJUDICE?"