Talk to your supervisor in dollars and cents. His shitty attitude is costing the business time and money because you're forced to rewrite existing code wheneve

Talk to your supervisor in dollars and cents. His shitty attitude is costing the business time and money because you're forced to rewrite existing code whenever he feels like rewriting a module. Personally though, I would quit and find somewhere else to work only because your supervisor doesn't care about your problem. It's not like there's a shortage for software devs.