I can't help but think the "ignorance and snobbery" comment was 180degrees misplaced...
I think it's just fear of the unknown from people used to tarmac and nothing else.
What scientific/statistical/empirical evidence leads one to this conclusion?
In our syndicate all of us have flown singles to/from grass strips (some airfields in better condition than others) but have chosen not to take our twin into grass aerodromes.
To keep this in perspective, I'd take someone else's twin into a grass airfield quite happily (if their club rules allowed such things), but not my own.
Exactly the same rationale as being more than happy to do EFATO practice in a hired aircraft, but not in mine, thanks.