Uh your not playing the same guy everytime.
You're not playing the exact same person, but multiple people do this and the traps are always the exact same sequences. It's irritating because such an opponent usually has no clue of what they're doing and is just trying to brute force all book traps they know until they're lucky enough to get an advantage against an inattentive player.
A fun chess game imo is when you have to apply your strategical and tactical knowledge in an unfamiliar situation against an opponent playing their best. It's not rewarding to win/lose against people relying on traps, there's nothing exciting and nothing to be learned from the game. Just boring old "If I hadn't been so bored by my opponent's playing / had been familiar with this trap, I would've had a simple win". It's a little bit like the difference between a human typing on a keyboard and a monkey typing on a keyboard. Sure, they technically can both make a coherent sentence, but the monkey doesn't actually have a clue of what he's doing. He just memorized the trick enough times to type one specific sentence faster than the human.
It's the difference between winning because you're better and winning because you're lucky.
lol