I cannot imagine any circumstance where I would be critical of someone else's performance at a singaround. Likewise when the person I am visiting breaks out the photo album and shows me all the old family pictures I would never say, "very nice, but oh my goodness, that's an ugly baby isn't it?" or "why on earth did your mother wear that to your wedding?"

If a singer pulled me aside one day and asked me for advice on their musical performance - I probably would not, unless I had a close enough relationship to ceratin that I could frame a comment that would actually be helpful.

Nobody's baby is ugly. Nobody song sucks.