Or even just a new DM in general. The whole thing is a group activity for mutual enjoyment. I ran a cyberpunk red campaign as the GM with 6 players for like a year, and it was my first time DM/GMing in general, and it was also a brand new system at the time. Everyone was very forgiving, lax and then serious in the story when it mattered. I certainly would have quit if people were assholes because my math wasn’t there or I had to flip pages to figure out like fire damage calculations without having them bookmarked or whatever