Tiger, we "hate" something (or someone) when we have a strong intense dislike for it. If we use "loathe", we not only harbour a similar hatred towards something (or someone), but also have a feeling of disgust. It's like showing a revulsive disapproval because you find it offensive or it does not match up to what you believe is right. Examples: 1) I had a hard time coaxing my cat to take a bath. I guess cats hate the feeling of being drenched. (Here, we use "hate" to show my cat's intense dislike of water, but I don't think my cat views water as being wrong or not living up to its standards.) 2) I hate people who are pretentious. (Here, I dislike the way pretentious people behave without being disgusted with their pretense.) 3) I loathe people who are pretentious. (Here, I express my contempt for people who are pretentious. In my view, they are morally wrong and I cannot stand the thought of these people. Their behaviour makes me uncomfortable. I despise them and feel that they can do much better.) In a nutshell, "loathe" has the element of disgust or contempt because someone is doing something that you perceive to be very socially unacceptable.

“Loathe” can be a very intense form of “hate.” But is also is a bit of a snobby word, like the kind of word some pretentious person in the “art world” might use, like in your quote. If you use “loathe,” you might come across as snobby or elitist. Or, you might just demonstrate to your listener that you really, really hate something. Which effect your use of “loathe” has depends on your audience and yourself.

"Loathe" and "hate" mean exactly the same, but "loathe" is more rare, scholarly or archaic word. People (Americans) say "hate" too much, it becomes weak. I hate it when people say "hate" all the time! If you say "loathe," it would be refreshing and humorous. People will like you for being funny & smart, & having good command of words. I don't think it sounds snobbish. (I hate snobs.) It depends on your group. I have had people get mad at me for saying "aurora" and "meteor," when they are used to "northern lights" and "shooting star." I hate people like that (just kidding). If you are with a fun, smart group of people, it always adds to the conversation when you use fun words. If someone is threatened by your vocabulary, by all means keep them comfortable, but don't lower yourself at all times for fear of standing out. One of the fun things about learning language is, when people use an unusual word, it often makes sense in a way that broadens people's minds. (That may not be true in Chinese, where the limited syllables make odd constructions unintelligible.) There is a great danger when using old words that have fallen so far out of use that nobody even remembers what they mean. No problem with "loathe," but use it for humor or emphasis, don't use it too much. I hate it when people only know one word for something. I love it when people have a rich vocabulary! By the way, I loathe Lima beans.

I'd add to John's answer that with the context being a movie, it is a dramatic word that doesn't seem out of place on film , in a play, or in a work of literature or poetry, but it would seem strange in everyday conversation.