League players don't usually say "noob"
Just wanna let anyone who's new to the game know that the quickest way to let everyone else know you yourself are new to the game is by calling someone a noob.
I've been playing for almost seven years now, and even when I was actually new, people didn't say noob. It's just... not normal for League. If someone wants to call you bad, they call you bronze, a feeder, boosted, or even just trash. But it's only people who started within the last year or so that think it's normal to say noob.