Honestly, with Tank as my first toon I was pretty petrified of DF as I was learning the new content. But I very very rarely had issues with people in DF. I heard all these horror stories but I have never experienced anything super terrible. When I'd announce it was my first time folks were usually responsive and helpful. But I never pugged/used DF for CM or Prae and by the time I was done with WP and started running AK regularly speed runs of WP became the in thing to do. So I've some how been really lucky in dodging the speed run community. Even in my DF Titan runs people were for the most part encouraging to those that were struggling.