JIM,I dont mind as long as I am asked, even if it is retrospectively.
flashes[as well as flashers] can be offputting.
I am sure traditional singers such as Harry Cox,found microphones being stuck under their noses in folk clubs off putting,I am sure someone mentioned this about a year ago on a different thread.
With modern technology,recording equipment is now less obtrsuive,
it STILL boils down to a litle subtlety, a little courtesy,Good manners and sensitivity to the singer,and sensitivity to the rest of the audience,numerous people jumping up and down with flashes can spoil other peoples pleasure.