Category View (Retention)

The other day someone referred to some of their clients as stupid.  I couldn't believe it .  Would you insult them in person I asked?  Do they pay your bills? Buy your product or service?  Would you do business with a company that called you stupid? I was (and still am) very frustrated with the experience for a few reasons.  Is this person calling me stupid behind my back?  More importantly as a marketer I work hard to generate leads and sales and if there is someone referring to my customers that way they are also belittling what I do for more...