There are several "singers" at the hall where I go who are truly, severely, tone deaf. They should be asked NOT to sing because it is distracting and their singing ruins the collective harmony.
I hear that! There is a yahoo in my area that sounds like he is trying to out Dylan Bob Dylan. He can't carry a tune in a bucket, yet he nearly yells the words. No singing just saying the words as loud as he can! And the one he yells the loudest? Gee-HO'-Vah!