I love DM-ing overall. I also have been blessed by having so many great players, who buy into the implied social contract of the game, specifically in regards of fun for all, including the DM.
One minor, and very occasional dislike, is if a player blames the ruleset or game system for something that happens to their character. I don’t mind if they blame me, especially if I make a mistake, but blaming the rules, while in session, does destroy the magic a little.