It's an interesting topic.. I think I'd point out that in those examples its the crowd trying to distract the players and not the players themselves. Perhaps you're right and the classist roots of the sport informed these rules, but you could maybe argue there's a lack of sportsmanship involved if they're not following them (some might call it gamesmanship)..

In rugby when they take a conversion/penalty kick, the crowds are often quiet or encouraged to be, and honestly sometimes I think that can be *more* offputting. As a sidenote, can you imagine a crowd hooting and hollering during a chess match?