It would go farther than that and actually I can see socialist/communist fodder here. You shouldn't get that promotion over Fred as that would be a triumph, you shouldn't send your kids to a better school than Phil, you shouldn't drive a nicer car, have nicer stuff, basically any and all competition in which there is a winner and a loser even when the competition is not formal. After all life itself is a great competition.
The root problem is theological. How unfair that you go to heaven, while some other guy goes to hell? They're mad at God because He rewards virtue, and punishes evil -- they'd rather have a world, and a universe, free from responsibility. They're also mad at God for differentially distributing innate talents, as it hurts their pride when someone else is better than themselves. Since ALL human competitions reward either virtue, or talent, or both, these people can't stand competition. It implicitly reminds them of Someone they'd rather forget.