Talking about conflict of interest in general is fine, but making it be about one person is almost never fine. Egregious cases might be different, but to use it as a routine device in an argument is a personal attack and doesn't belong here. This is important because people on the internet are much too quick to jump to such conclusions about people they disagree with. See https://hn.algolia.com/?sort=byDate&prefix=true&page=0&dateR... if you want to read about our thinking on this; there's a lot of material there.

> contradicting me is not a personal attack.

You've moved the goalposts though. If I contradicted you by saying you were lying for personal gain, that would be.