Some individuals make it hard to be civil with. I have yet to personally encounter an angry contractor on one of my projects. I have had a few phone calls and emails. One guy even threatened me. I don't take kindly to threats, so I told him I'd meet him at a certain place at a certain time. He was a no show.
Chances are you will never encounter this guy again Tony. If you do, or if he threatens you, either verbally or written, you have legal options available to you.
When you get a chance Tony, you might want to improve your signature line. One of these days one of us will create a sticky thread on how to create a productive signature line. At a minimum, your signature line should include your business name, business phone number, and a click-able link to your companies website. This is all beneficial to your business and your websites SEO and viability.