That's not happened once to you!
I've had plenty of PMs sent to me in LFS of similar context as you quote and have sent many PMs to others as well. I have on multiple occasions, spectated because I've seen someone driving "erratically" and figuring (correctly) that they were new, have helped them for the rest of the evening. I have multiple times left a server after telling someone new to LFS to follow me to an empty server.
I've had the same experience when I was new, first with my very first S1 demo (Feb 2005) server join when Mach1 left his race and helped me with settings all night long. Then again, with trying to drive the RWD when we got the S2 demo, Gimpster had joined me in an empty server and took the time to help me get controlling the RWD all evening.
I can't tell you how many times I've seen "Go offline, you noob" in the chat, but again, I also can't tell you how many times I've seen someone help someone out who needed the help as well in my 3+ years of LFS.
There has been plenty of attempts at "driving schools" made here on the forum to help out new people. There was even a drift team that extended a special server for racers to join to try their hand at drifting. There's plenty of help and good words that come from LFS members.
I can tell you one thing for sure. You will never see me yell "Go offline, you noob" in the chat. In fact, just last night, someone was directly in front of me who obviously did not know the track and braked in a spot that did not call for braking. He took me by surprise and I sent him into the wall with my bumper. I pulled over to his wrecked car, apologized, but let him know that you don't have to brake for the corner in an attempt to help him out. He then apologized to me because he didn't know the circuit. Can't remember my exact words, but I let him know that it was me who hit him from behind, no matter what the circumstances that caused it was, and it was my fault.