“I learned long ago, never to wrestle with a pig, you get dirty; and besides, the pig likes it.” – George Bernard Shaw

There are some other great quotes on stupidity:

“Firmness in decision is often merely a form of stupidity. It indicates an inability to think the same thing out twice.” – H.L. Mencken

“The difference between genius and stupidity is that genius has its limits.” – Albert Einstein

“It is impossible to defeat an ignorant man in argument. ” – William G. McAdoo

…and this one is probably my favorite:

“The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.” – Bertrand Russell

Ignorance is not bliss, ignorance is ignorance!

I’m not offended by dumb blonde jokes cause i know I’m not blonde or dumb – dolly parton