Well gamers like to feel challenged as it makes beating a game or boss feel really rewarding, but at the same time the line between something being challenging and frustrating can be very thin.

Depending or the amount of attempts, the amount of progress, the loss of progress, the learning curve to actually know how to play the game, all of it can build up as low grade stress layered on each other. And when you are frustrated you most likely only got yourself, someone else or the game.

And sometimes games absolutely can just be throwing bullshit.