I think any tone that implies "Duh, how obvious" can easily be (mis?)interpreted as "Duh, it's so obvious, you'd have to be dumb not to agree." Eyeroll comments are, IMO, received best when the poster makes it clear they're rolling their eyes at themselves.
Oh, absolutely. I agree with you. But if you (general) do think that a poster is being eye-rolly at everyone else, isn't it better to say, 'Excuse me, but are you saying that we are all X, Y and Z, because I find that offensive', rather than posting a rude comment in reply?
The OP is not the only person posting in the thread and whose opinion matters.
Wasteful =/= sinful and gluttonous
No, of course she's not.
There were two separate things: buying food with the intent of throwing it out (wasteful), and overeating (gluttony). LG started by saying that she thought the first was unethical. By the end of the thread, she'd decided that the second was also wasteful, and therefore unethical. She didn't *call* any other posters *anything*.
Honestly, even if she said that eating more than three slices of bread per day is a wasteful, gluttonous, sinful habit, I'd just think she was nuts and disagree with her. Politely
. Clearly, the word 'sin' crossed a line for some people - so, tell LG that!
I disagree that Lady Pekoe's response was polite. That's the crux of the matter.