Newb: (noun) a person new to a game and/or gaming (newbie<adj>)...usually friendly and willing to learn...
Noob: (noun) a term used in a derogaroty way by someone with an inferiority complex trying to satisfy their own ego...
or...
Noob: (noun) a person deserving of the title if said person is acting like a moron or being disruptive to others...
Remember...it's not what you say it's how you say it...
ex: "You can lead a horse to water but a pencil must be lead"...
Reminds me of something my great great granddad Poopdeck Pappy always said...
"Never try to teach a pig to sing...it just wastes your time and annoys the pig"...
Draw your own conclusions...