I think some of u guys are over-analyzing the situation (although your theories are pretty cool). Some people get on LFS to really race, some to relax after a hard day's work.. some take it serious and some take it social/casual. Kids WILL ALWAYS be immature relative to an older crowd, so there's nothing new there.
There are avenues for serious no-nonsense racing like the big leagues (OWRL, Gentlefoot, iGTC, etc..). I don't think you'll find spam/chat there. If you're serious and mature, I think you'll align yourself to take the avenues that best fit your expectations.