I suspect that if you made a post to the group, people doing it would act offended and say things like "well I just mean the food I'm used to" or try to justify it somehow, no matter how polite you are.
If they're already talking/thinking that way, being confronted doesn't tend to make people change their minds. But if you said things like "well I'm used to eating this food, but normally more of it and with additional fresh veg" and so on.
The best way to change someone's mind is to ask them carefully-worded questions, and lead them into changing their own minds. But it's a lot of effort and tends to work best one on one.
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If they're already talking/thinking that way, being confronted doesn't tend to make people change their minds. But if you said things like "well I'm used to eating this food, but normally more of it and with additional fresh veg" and so on.
The best way to change someone's mind is to ask them carefully-worded questions, and lead them into changing their own minds. But it's a lot of effort and tends to work best one on one.