Psychological projection and autism

Hello, 

i would be very interested to hear thoughts on how common it is for people on the spectrum to be psychologically projecting their issues and such onto others around them especially when not dealing with their own problems or issues? 

for example a person on the spectrum claiming that people around them are selfish and self absorbed in their own problems when in turn this person is doing the exact same thing without being attune to how their actions affect others or how it may upset others. 

How to help this person or how to cope with being on the receiving end of this as well?