I attempted to explain why his comments weren't constructive, but he wasn't listening. This is why I deleted my comments. I agree with you and said something similar, but he kept thinking I was insulted by his comments. It's unfortunate to see that another developer is being so judgemental and using insults instead of working together to make other developers better. Fortunately, the people that are open to teaching and providing constructive feedback are the ones that end up making the largest impact, and become the best developers. Hopefully he will think about his actions and decide to turn his attitude around.