If what you do only means something to you in relation to other people not having what you have, you are a sociopath, plain and simple. Especially in a video game.

Who says a casual can't get that even if it takes them longer and still feel like it was an accomplishment? And because they achieve it, why should that bother you so much? He said "I dont the idea of casuals running around in [my special little gears]". You get it faster because you're so pro or whatever, great job (also nobody cares), they get it eventually at their own pace. When they get it, you get mad, that's at a minimum weird and at a maximum something a sociopath would get angry about.