The American show, "the Music Man," was first staged in 1957. (The movie was made in 1962.) In the show, the protagonist characterized the local pool or billiard hall as a place for gambling, swearing, drinking, etc. which did, in fact, reflect the perception of the late 1950s. a time characterized by "McCarthysism". The Wikipedia article said that by the 1990s, about 40 years later, the stigma had disappeared.
The movie itself, however, was set in 1912, a somewhat different time period, 45 years earlier. Were billiard parlors and the like then viewed in the 1950s light described above? If not, how did billiard parlors later gain their unsavory 1950s reputation? If so, how did they lose this reputation by the 1990s?
(One of the features of the movie is that it featured faux juxtapositions. For instance, the protagonist was shown to be a "con man" when he claimed to have graduated from a certain school in "aught five" (1905) and the local librarian discovered that the school hadn't been opened until 1906.) Thus, it's at least possible that the show "cut and paste" 1950s morality for its nominal setting.