http://www.topgear.com/uk/videos/rallycross-part-2-series-18-episode-7
What amazed me is none of them complained about fair play, except hamster at the end but that was for the show.
The red Saab still took place in the race afterward. He didn't got kicked out of LA.
And it was in real life.
I understand how to have fun and play fair but it is impossible to have rules and etiquette for every situations. Heck, I drive in game like I paid the car in real life but how many times i've lost cause i didn't want to be portrayed like Schumi. Trying to follow GTP rules clearly didn't made me a better online virtual racecar driver.
Here is the situation OP is describing.
To me, its almost reckless driving, diving on the inside, touching, pushing the envelope.
What about this ?
Clearly against GTP rules around 2:00 mark yet one of the most memorable moment in F1 history.
Its pretty much easy to figure out who is racing dirty but in the heat of the moment its much harder to see who's having bad intentions, who's having the skills, who should be penalised. You gotta considered tons of factors. I got two friends in my FL who quited GT 5 cause of the severity of online rules I was racing in. They didn't have bad intentions.