I seem to have upset a new user here:

Allow a user to run a program as administrator permanently

When I pointed out that his question has been asked a few times, he said that none of the solutions on the other questions worked for him (they weren't secure, etc.) and that my remarks were "garbage".

In cases like these, I'm of the persuasion that the question is still a duplicate. Does merely saying "none of the answers on the other question worked for me" make a question unique?

More importantly, was my response appropriate or should I have handled it differently?

If I can merely add a qualifier after a question to make it unique, one could assume that we could have series of questions like:

"How can I fix X problem?"

"How can I fix X problem, but without Y method?"

"How can I fix X problem, but without Y or Z methods?"

"How can I fix X problem, but without Y or Z or Q or M or B methods?" (You catch my drift)