idiots.
if you are asked to review a paper you have to judge that paper and stop.
if previously you did the same for another journal and now you are annoyed by the author, then you should not take this in consideration. if you are not able to do this, then you are in conflict of interest.
Son, I think now is the time to tell you about an important thing: Sometimes, people do not act as they are supposed to do.
So yes, it is wise to take into account that if you are a pain in the ass of editors and referees, they will reciprocate at some point if time. Even if you think they shouldn't.