Why are silver's unable to take advice?

I was just in a game with a silver AP main. His team absolutely destroyed ours and he beat me by 50 cs. Their akali was godlike by the 15 min mark and their jungle Sion was basically going where he pleased. He insisted on giving me advice at the end of the game in some snobby ass way, 'you really need to learn to cs to get better at this game'. To which I replied, I came from bronze and made it to plat by playing ADC, and I know how to cs. We then got in a long winded argument and I tried explaining that as Ashe, against a team that can 2 shot me, I literally can't go farm on my own when the rest of my team is constantly dying. I tried to explain team composition and that him beating me in CS in ONE game isn't reflective of skill, its a reflective of the match as a whole. He basically bickered that he's an AP main and he dominated me and yatta-yatta. I'm not saying I'm a pro, as in no way am I. But I'm literally trying to help him understand that it's more about numbers in the end game lobby. Its a reflection of the match itself as I can't just go out into lane with 0 sight and CS with Ashe.

TL;DR I try to give advice to someone in a lower rank then me when he tries giving me smug-ass advice. Why can't they take it for what it is, or not take it at all. I don't normally rage, but I'm trying to give this guy some honest advice to help him and he needs to throw that he's an AP main therefore he's much better then me in my face over a highly one sided match that was not even reflective of him (he did well because mid and jungle were stomping)