I don't care whose fault it is. I just want whatever the most popular and most used format is to be able to read whatever a client sends me. I don't have any problems with other PC users, but I always get problems with Mac users, and their attitude when I have to go back to them and ask them to do it again is invariably "if you had a Mac this wouldn't happen". Yes, and if they had a PC it wouldn't happen, and majority rules.
I don't know how I feel about the "majority rules part" but personally it is irrelevant what the majority is. If you were in the minority, and they were sending you a file, they should make sure what they send you is readable to your standards. That's just good service.