I hate when people talk / use phones at movies, its a huge pet peeve of mine.
First off, seeing movies is expensive. In my area, a ticket is $13 for the base ticket, before taxes, no 3D etc. Second, my wife is at teacher, so this limits when we can see movies. Now that we have a newborn, its even harder as we need a sitter etc. I just think it's plain rude when people talk or use phones (there's usually 2 different announcements before and after the trailers to tell people to turn their phones off) and others have to use so much effort just to even go to a movie.
I have absolutely no problem with public shaming of people that use phones. If someone "forgot" to turn theirs off, OK - it's mistake and I let it go, first strike. If you're checking your phone 3 times to text etc, I have no problem yelling "Hey, turn your phone off". People don't look at me, they look at the goofball with his face aglow with his smart phone on.
The worst incident I had was watching the Amazing Spider Man and a group of teens, probably 6 of them sat in front me and my wife, it looked like they had an older family / guardian with them, like an older uncle or something. 2 kids are using their phones during the previews. I let it slide, since it's not happening during the movie.
Throughout the first 30mins, they are constantly chatting. I do the embarrassingly loud "EXCUSE ME, could you guys keep it down please?". They stop start constantly amidst "Shushes" from the audience. One guy busts out his smart phone at least 3 times to text in open view, and I do the "Do you mind turning your phone off?". Proceeds to hide it and then starts texting while bending over. I ask again and again until he finally stops.
On top of this, the group of teens are constantly heckling the screen characters lines and making fart sounds. Seriously? You guys paid good money to watch this movie to heckle? I finally unloaded on them and yelled "Do you guys mind, we're trying to watch a movie here!" and they finally shut up the last 15 mins of the movie. I complained to the manager and got a pair of comp tickets, he also asked if we wanted a drink or food as consolation, we just took the tickets for another time.
I kind of wished the ushers or whatever would stick around after the movie starts and check to make sure things are going smoothly. I think they used to do it back in the day, but not any more.