Nathan, you are correct. You do not deserve the personal attack. I made assumptions about your background (thinking you an engineer — one of my “people”), then compounded the fallacy by unfairly making my response about you rather than focusing on the problem.
I’ve left my original statement intact, but edited to indicate a retraction is due you, as well as the public apology to both you and Alanna.
Thank you for your civil response. It shows that you are open to learning what may or may not work. I did not give you the benefit of already knowing this is key to any helpful change. Again, my apologies.