Personnally I wouldn't do anything. Why sink to their level be professional and above it all. Most likely they don't know the full situation in as much detail as you've given us.
Why start a war over talk. Like you said they can't do anything about it and if their really that upset wind them up by letting them think it was intentional because studies show that blue light is visible from the furthest distance away and you guys put them on the rear for safety purposes.
I'm not familiar with NY MV Code but most that I'm familiar with, restrict the colors as displayed to the front not to the rear anyway.
Why start a war over talk. Like you said they can't do anything about it and if their really that upset wind them up by letting them think it was intentional because studies show that blue light is visible from the furthest distance away and you guys put them on the rear for safety purposes.
I'm not familiar with NY MV Code but most that I'm familiar with, restrict the colors as displayed to the front not to the rear anyway.