Many of us have been in positions where we meet other expats who aren't as knowledgeable. Do you tell them the truth, or just ignore it, and let it go?
For example, some foreigners don't know things like Thailand has universal health care, and it's a 30 baht user fee to see a doctor, regardless if it's for 10 minutes or a month. Then the wife is saying it's 70,000 for health costs per-year, which I know full well is bullshit. Do you tell them, or let it slide in order to not wreck the relationship?