Same here. Everytime I do a new dungeon I mention that this is my first time. For my own experience, I have never had any problems. My fellow adventures have always been understanding, many going over the tactics even if I mentioned reading up about them. The in-game community has been great in my experience. Of course I do know that there are jerks out there, but my advice to the OP is to ignore them. Listen to those who do give advise, and practice your class. It can be intimidating to start a new MMO, let alone your first, but over time you will become more skilled and soon you will be the on being asked for advice from a new player.
The problem with this is that searching out mean having to go to the wiki or youtube to find out what to do. Yes, it is not hard but should that really be how a game is played? This is one of my MMO pet peeves. What ever happened to the thrill of exploring a dungeon, working out the mechanics as a team and having fun? Why should it be a sign of weakness to show that you are experienced anyway? Players nowadays seem to have lost that sens of exploration and fun, with most just wanting to complete the stage as quick as possible. And no, I do not blame the Duty Finder. I saw such attitudes in WoW long before its DF was added.