Around here I have never encountered rudeness or noisy patrons or really anything else that would be annoying. A few years ago cell phone interruptions almost made me give up going to the movies, but its literally been years since I heard a cell phone go off, or someone try to have a conversation while watching a movie. I think texting has replaced phone calls and if the sound is turned off, someone could be texting and never bother anyone else.
FWIW, much of the older movies do not hold up well, in my opinion. They were a very stylized form of acting, and was what folks expected before more realistic, "method" acting came into vogue in the 1960's and ever since. Even classics like "Casablanca" seem so dated as to be almost unwatchable to me. And the pacing of movies in the era prior to the 1970's was very slow compared to films today. Maybe it just depends on what kind of movie fan, if any, a person is. Many movies even from the 1970's and '80's seem just strange today, and the hairdoes and the sound track make it hard to take the film as seriously. An exception to this, in my opinion, is "Deliverance" which apart from the hair styles seems as good today as it did when it first came out. On the other hand, some films that many people love, like "The Sound of Music" I find truly a torture to try to sit through. I guess it really depends on the film itself because there are some of what were called "screw ball comedies" from the 1930's and 1940's that are still worth watching even now, like "My Gal Friday".