There are a couple of reasons why Lorraine is not a fan of Baron Park Zoo. Firstly, she doesn't like seeing all the creatures kept in captivity just so that people can gawk at them.
Secondly, she is of the opinion that the attendants who work at the zoo are not all that intelligent.
She had stopped going to the zoo a few years earlier, after watching the sea lions being fed. The zoo employee did not bother to throw the fish up in the air one at a time and in different parts of the tank so that the sea lions could have a good time and get some exercise. Rather, he simply dropped all the fish into the water while standing on the diving board.
In short, Lorraine is an animal lover and does not agree with the way things are done at this zoo and probably at zoos in general.