the most unrealistic thing about o'brien is that he's somehow turned off by japanese food. he's dozens of generations removed from sushi becoming a fad. i fully expected him to complain to keiko that proper japanese food is deep fried like in his homeland of michigan, ireland.

but in all seriousness, a major subplot in that episode of TNG was about o'brien confronting the racial hatred instilled in him by the war. its not surprising that people on twitter are trying to find degrees of racism with the slurs he uses, but its still weird.