Loud audience in movies

Recently been noticing how people are freely loud in between movies. Went to watch a movie recently and it was horrible, even though the movie was great. Had to watch the entire movie by getting upset because of how people were taking calls in between the movies, commenting and explaining very loudly + talking casually to their friends/family loudly as well. Phones ringing repeatedly and then not even cutting the call or putting their phone in silent mode.

Why isn’t the ones coming to watch, aware of these basic understanding of what all to do and not to do while being inside a movie theatre.