Rethinking "retaliatory feedback"

One standard of CC was always "no retaliatory feedback". Basically, the idea was that you should be able to rate someone who plays badly without worrying that they will, in turn rate you down.
HOWEVER, the problem is that sometimes it is the feedback itself (under the old system) OR , now, the rating that IS the problem. That is, someone who gives all 1's just because they lost.
Under the old system, this usually became evident over time. Now, it is all but impossible.
There is no real way to know if someone got all 1's because they were in a really bad game in that one game or because they played a jerk. More importantly, it becomes even more difficult to avoid those players that consider this a reasonable way to rate.
I suggested posting the number of 1's someone leaves as a possible answer. But, I don't know if that is the real answer.
PLEASE DISCUSS!
HOWEVER, the problem is that sometimes it is the feedback itself (under the old system) OR , now, the rating that IS the problem. That is, someone who gives all 1's just because they lost.
Under the old system, this usually became evident over time. Now, it is all but impossible.
There is no real way to know if someone got all 1's because they were in a really bad game in that one game or because they played a jerk. More importantly, it becomes even more difficult to avoid those players that consider this a reasonable way to rate.
I suggested posting the number of 1's someone leaves as a possible answer. But, I don't know if that is the real answer.
PLEASE DISCUSS!