What you said was:

Such is the state of the art in self help: there are enough gullible prospective clients that it is never in the financial self-interest of any practitioner to do the hard long work to collect evidence that would sway a non-guillible client.

In context, the strong implication was that nazgulnarsil was a "gullible potential client", and that I was preying on him for my financial self-interest. Whether you intended those implications or not, they are nonetheless viable interpretations of your words.

I feel I should also point out that you have not yet denied intending those implications. Instead, you are treating my comments as if they are an argument about the simple text of your comment -- which they are not. My objection is to the subtextual insults, not about what studies I should or should not conduct.

As I said, if you talk like this all the time, it's really no wonder you get feedback that you're treating people with contempt. If you want to signal less contempt, you might find it useful to pay attention when they point out to you that your implications are insulting, and take pains to separate those implications from your actual position. Otherwise, you imply contempt whether the original implication was intentional or not!