Thanks, Jo, I can't get Charles Aznavour out of my head, every time I see this thread pop up. ("Yesterday, when I was young...") But it's a very gentle tune, anyway.
It's pretty understood, once you've been here for some time, that it is the critiquers own opinion you're getting, nothing more. That's what's wanted, that's what's might be needed, to help you with your writing. When you first arrive, if you're not careful, you see experienced/published writers offering advice and you think 'they must be right, I'll change it'. You can end up writing for other people, not yourself. If twenty people tell you your pov is wandering and distracting, then it probably is*. But if one says it, and nobody else mentions it, then it's up to you as the writer, to accept or reject (or just ignore) that one comment. But if it makes you think about your writing, consider what's been said, and you still don't want to change anything, then that is you strengthening your own writing, I feel. You write for yourself, but you want it to be the best it can, that's why we ask for help/opinions/critique. If a critiquer is rude with their opinions, or tells you 'this is the way it's done, and you're not doing it correctly' then IMHO they shouldn't be offering their opinions at all. If they knew everything, they'd be million-sellers, wouldn't they?
Talking of million-sellers: many years ago (OMG, I just looked and it's 9 years ago!!!) Patrick Rothfuss critiqued my novel and naturally I listened to every word he said, why wouldn't I? But, gathering confidence as the five hour telephone conversation went on (this was the result of a charity auction in the very early days of Worldbuilders) I argued a few points. And he conceded. But then he asked me: "why did I point those out? What you've just told me (my arguments) aren't in the book." Another 'doh' moment, one amongst many. I looked at my own work completely differently after those words. I didn't change what he'd pointed out, but I made them relevant by adding to earlier sections. (I did a complete re-write after his critique, I should point out... of all the things I realized could be improved. Changed, possibly, but improved, definitely.) If Patrick Rothfuss can do a critique of a newbie and be gentle, polite, respectful, then we all can, no?
*Read Shogun: the most head-hopping, pov changing, multi-million selling book of all time. My favourite book of all time, as it happens. I cannot imagine it written 'correctly' and be the same. The head-hopping, pov changes work, it's as simple as that... I might need to read it again, now I've mentioned it.