5)try to insist I sing. I don't sing. ... I'll sit and enjoy YOU singing, but kindly don't nag me about adding my voice. Next time, I'll oblige.
I get the same thing. Fortunately my fiance (highly musical, gives music/singing lessons) understands that I prefer not to sing.
Unfortunately one of my less sensitive friends, a great singer and dancer, kept on at me about how I should learn to sing and dance, just listen to your voice, etc etc etc. He kept trying to manipulate me into learning by telling me sad stories about people who'd never learnt. I managed to get him to shut up about learning to dance by going along to a class with him and (despite giving it the old school try) completely embarrassing him with my ineptitude.
Unfortunately his rabbiting on about how I should learn to sing has made me self-conscious to the point where I don't even open my mouth during hymns at church and I now feel terrified of any kind of singing lessons, even though I could learn in theory (I'm not amusic).
Nagging people about participating or learning to do an activity they don't want to/can't do is very rude.