This is the internet. We have to expect the rough with the smooth.
Pilots are not some kind of exalted breed. The profession contains all the prejudices as well as high standards that you might find in any other.
Most threads end up with more sense than rubbish being traded, however crudely they may start. It's a great site and it's about as well moderated as it could be, given that it respects free speech.
If it wasn't PPRuNe it would be another site, and probably not as well run.
Don't let 'em grind you down, Danny!