I agree...there's a time & a place. Like you I also switch my phone off if I am at dinner, or at least have it on silence when I am in company so as not to be disturbed. I know for some people in case of emergencies they prefer to leave the phones on....so the kids can contact them if they need to etc... Yeah I understand that too. But I agree sometimes its just not appropriate. I do get a wee bit peeved at it myself!
Can I just add I learned the hard way after my phone ringing out a loud rock tune in the middle of a funeral service!! I had forgotten to switch the thing off & well, I was mortified!! Luckily for me the family felt my frantic panic as I blindly plunged my hand in that bag trying desperately to find the off switch!