Do other bikers have "feelings" towards me depending on how I treat them?

Solution 1:

Yes, how you treat other bikers during the race supposedly does affect how they feel about you and treat you in return. This video mentions how bikers that you schmooze with will be more hostile toward you if you beat up on them more, and the Fighting section in the manual supports this. It states:

The more you rag on your opponents, the more they're gonna want to take you down. Go easy on 'em and you might pick up some riding tips or dirt on the courses, so to speak, next time you drop in at Der Panzer Klub.

So if you're less aggressive toward other riders in the race, when you meet up with them in Der Panzer Klub instead of insulting you they will actually give you tips and secrets about different courses.