How is the first one even valid? all it says is "I do not like this member" how is that a valid reason just because you don't like them does not mean you can just neg rep them, its just like me neg rep you 10 saying "i don't like this user because he is spam staff" that would be just as bad as the first example.
The second one is Invalid without a doubt, and the third one for me is 50/50 i don't know what to make of it i just used that as an example because its hard to find a valid neg rep reason on FK