This is the internet. The internet can be rude sometimes. You'll often run into those trolls that will try to rile up other members and mods. My advice is to ignore them, and if it comes down to it block them. If they keep being rude to you, or even harass you, report it to a mod.
Irronicaly ,there are numbers of knowledgeable person who also acts rude or are full of themselves on the public chat only because theoretically their knowledge is so great and they are superior to the poor beginners.
My advice is simply to ignor them as stated above!