You don't give other people very much credit with that sort of approach to conversation.
I'm sorry my approach had that effect, but I'd like to point out that I did say that I believed you were very intelligent, which is a credit, and that I thought you had a powerful resistance, which is not that much of a discredit since I think that probably applies to most people, though perhaps with other resistances than this. I also made it clear that it was merely my conclusion, not a proven fact.
it's obvious that i'm wrong -- very condescending
If it is in fact obvious that you are wrong, I don't think it is very condescending to point it out, though there may be a matter of gentleness I'm missing.
If everyone assumed that people who disagreed only disagreed because they have a "powerful resistance," no one would be able to change their mind. They'd all just hear other peoples' differing opinions and say, like you, "Oh, they must just have a resistance to obvious reason!"
On reviewing my past experiences, these consequences have not showed up for me, and I think that if everyone followed my example (not that I'm recommending that), they'd get similar results. I'd also like to point out that I don't automatically assume that people who disagree must necessarily disagree because of powerful resistances.