It seems to me that the main problem here is not whether the motorbike or the car was right, but the fact that two people were involved in an accident where a motorcyclist flew to the ground and their first concern was to make sure that the their car had not been damaged.
Whether they are foreigners, Russians, or something else, and that many Thais would also have behaved in the same way, it doesn't matter: they are two mean people who deserve shame.