It won't completely stop at lvl 50 but slowly drop as your lvl goes up. Now that I am lvl 69 I don't get called a noob at all, unless I'm on a spare account. I never call people noobs unless they provoke me or act rude, since you did neither they had no reason to call you that. I've also noticed that almost every item i get unfairly I.E. buying an item cheaply off a low lvl that doesnt know any better, ive lost it. Like one time a girl's pick head fell off i took it and even got the handle from her. We'll before long I lost it too a scammer. I'm not mad because I know he will either loes it or get banned.