That manager is telling you something about their own brain without meaning to. People who get that upset about colors often have a real control problem, like they can't handle any visual noise. Maybe they're the type who freaks out if a pen is out of place on their desk. Forcing everything to gray is just a power move to make their world feel less chaotic. Honestly, it's more about their issues than your spreadsheet skills.

Mine paid for itself in under three years, honestly.

Wow, my cheap watercolor set from the dollar store turned out pretty good too.