Ah yes, I remember them well.... people mumbling often extremely cringeworthy lyrics into the soundholes of their guitars. In most cases only the front row, and possibly the second, were able to 'share and enjoy' what was being offered. With hindsight, and as a songwriter as well, I feel the problem is) that these people haven't realised that, no matter what music you're playing, you have to establish a link with the audience. Presenting your song(s) as if you're praying for the ground to open and swallow you up is generally an audience turn-off. As the jazz song puts it,"It ain't what you do, it's the way that you do it." I've written songs which, for me, have a personal background, but I try to 'package' the story in such a way that the audience reaction is not, "Oh God, that's all so embarrassing!", but rather,"Been there, done that, didn't like the T-shirt either, but hey, that's an interesting slant on the 'failed relationship'(or whatever) theme", and, for the songwriters present,"Why didn't I think of that way of dealing with the topic!?" Or to put it another way, it makes a difference if the audience feels you're standing up for your song(s) or not. Whether or not you're a good singer, instrumentalist and/or talented wordsmith is often a secondary consideration, the main thing is to stand up for what you've composed.