Sorry you had soo much bad luck - I've not had too many experiences like that. However, I tend to step out of situations - I did have one family that was irritated that I was assigned a specific seat and I didn't want to deal with their negativity so I flagged the CM and asked if I could just wait for the next ride vehicle. The CM was actually grateful and the family felt like they got pixie dust. I don't get the "I have to have that seat" mentality because I don't think I've ever had a bad seat for a ride.
But as a whole I've found people very nice to me as a solo traveler.
This year I went alone - and loved it! My friends and family dislike the festival so it was nice to do exactly what I wanted there. Also, I met the greatest people sharing tabletops around the world. Also, I saw more entertainment because I could just grab my drink and walk up without trying to move a group around.