Don't pay attention to them, asshats are everywhere sadly. And if you're lucky, you'd get a guy like me who is willing to help you learn the dungeon (hopefully without having to outright tell you what happens, learning by doing is by far the funnest way to do it in my opinion, I never watch videos beforehand).

Plus you have a chance to prove yourself sometimes as a first timer. My first Ultima HM run was with my brother and one of our best friends, all three of us were new. We all said we were new and only our friend had watched a video. They threatened to kick, but didn't (think they didn't have enough of a majority since the 3 of us came together). Only explanation was "stack on orbs and dodge". Wiped a couple times (mainly because LB used at the wrong time towards the end, lag excuses, which probably was legitimate, friend was having lag issues too). In the end one of them said something like "I'd be glad to run with you new guys any day".