Am I the only one that intentionally spins out my opponents during races? I know it is kinda messed up to do especially when you are close to the finish line. There is a lot of money on the line and you completely ruin their dreams while laughing loudly in the mic. It really reminds me of the rage and joy experienced in Mario Kart.
I do it to my friends sometimes. I don't play online though so I don't know if I would do it in a public queue but I suppose once I get a feel of what other people are doing I'd know what tricks are fine and which ones are frowned upon.
Surprisingly, I haven't met many people that do this (on purpose) so I don't do it either. But I do mostly play with friends.
I do it mainly when playing against friends when playing but it is just for fun. In random races, I don't usually engage in such a practice because I like to win fair and square - unless weapons are enabled during the race. Then anything goes
I think some of the time you can see that opponents need to understand that everything is fair in gaming. So I don't see much of an issue with that.
I wouldn't say everything is fair - cheating and exploiting glitches and game mechanics if others aren't also doing it is frowned on.