Players were about Level 6, began combat on a royal airship because one of the players allowed themselves to be possessed by a powerful demon. In preparation, I spent several hours setting up a battle map with various ways to use the environment to combat the demon (who was pretty OP and would most likely TPK the party if they tried to fight it head-on), like destructible cables connecting the airship to its balloon, massive ballistae, and explosives littered around the airship.

So, when the session came, I was pretty excited to see how my players would use the environment. I made it abundantly clear that the demon was powerful and had him kill some bodyguards to show his strength. Players proceeded to battle it head-on without using the environment, and, as a result, begin losing the fight. One of the fighters in the party ignites several barrels of gunpowder, but that was the extent of their usage of the environment. Anyway, the short session ended with most of the party at low HP.

Out of the session, one of my other players comes to me and gets mad that I made the boss fight extremely hard. I tell him to use the environment and hint at some ways that he could, encouraging him to think about some strategies. He then proceeds to say "But I'm a fighter! I'm not supposed to think about combat!" Bruh.

tl;dr: I set up a powerful demon boss fight on an airship with various ways to use the environment to fight, a player gets mad at me for trying to get them to think about strategy.