I was looking at something very similar.
Is there a way to "OR" items when "Is not equal to"? With "is equal to", you can just add another line with the same field type, if you are trying to avoid certain values, it doesn't work. I hope some of that makes sense. Below is a screenshot of what I am trying to do. Basically have co-op games so I want to avoid fighting and fighter / versus. This doesn't work but I assume something similar would.