i must be hanging around very different singine events. I don't often hear anyone sing out of pitch. I hear people who should use their diaphram more and who sometimes can't reach a certain note (probably because of nerves and dry mouth) but I rarely hear anyone sing out of pitch or off key.
I do think guitar player shouldn't be issued their flat pick until they have finger picked for at least five years, and have passed the flatpick licence board, but I don't try to enforce that at any music venues.
I do get really annoyed when people either talk loudly near a performer or try to rearrange their kit while they are performing, but again that's rare. and I hate people reading the lyrics off a cell phone.
the only time read lyrics of any kind are ok , is when an issues comes up at the event and you know a perfect song but can't remember the lyrics, and then only if you are good at cold singing from sheets or cell phones, which most people are not. I did gigs for a few bands over the years and had to use sheets as they did stuff I never sing, so I got good at reading and singing at the same time. it isn't as expressive as when you know the lyrics but it can be done very well, if you practice the art. best practice is at a lot of gigs. then you will actually try not to look a fool and quickly prefect technique of fast reading.
but guitar players, learn to finger pick. it's a ;lovely instrument when picked and pretty dull most of the time when flat picked. you have to be twice the guitarist to make flat picking interesting. it can be dome but few do it.
and Englishmen don't want to look silly? I thought they were doing that on purpose. isn't fawlty towers a documentary?