Yeah, animal abuse is one of those things I really hate. ;-;
I've actually answered this question before so here was what I said:
"One of the things I don't like about the gym I frequent are the users who use their phones while hogging the weight machines. Either that, or they will complete their exercise, continue sitting on the machine and talk to their gym buddies. So I'm standing there, waiting for you to get off the machine so that I can use it, but you're still sitting there and texting on your phone. I'm not annoyed or upset by it since it's no big deal, but I don't really like it since you're wasting many people's time (it's a constant occurrence, in my experience)."