Personally, I've found the opposite. I find people are much more likely to be disrespectful if you go in expecting them to be. That is, once you expect them to be that way, you'll treat them that way (consciously or subconsciously) and then they'll be more likely to be rude back. I go in to each roulette expecting that people will be decent, and that the person on the other end of the monitor is not much different than I am - just some person playing a game and wanting to have a good time. I very rarely run into rude players.