I'm now part of his targeted business audience. His ads go in the recycling bin, my business went to a competitor without hesitation, and friends and neighbors who ask for referrals hear both my experience with this guy and get the number of his competition. He recently tried to connect with me on social media. He doesn't remember me, but I vividly remember him.
There's an adage about learning someone's true colors by the way they treat the wait staff. I'd say it's true of the way someone treats anyone "beneath" them, and that it's pretty easy to napalm a bridge they never even considered might exist, but might want to cross someday. Character matters.