Sorry but you are giving way too much credit to many of the people who are racing online.
If I had to put a number on it, I'd say that 80% of my racing online has been totally clean.
I raced for 2 hours yesterday and only one other driver couldn't stand that I was 4 seconds faster in the same car. So he pushed me off all the time and brake tested me several times (trying to give me penalties).
But the number of these fools are declining, and in races I often choose I know quite a lot of the drivers there, and we have a lot of respect for each other. I've had some very very nice battles with some fast racers out there.
If you get knocked off, just stay calm and don't take revenge. Otherwise others drivers will see you as a punter etc etc.