Keep dancing. He built the straw man but he didn't knock it down. He still built the straw man. Often, the straw man is so obviously flawed that it doesn't have to be explicitly knocked down.
Who is dancing. I pointed out that technically he did not build a straw man because he did not. For it to be a straw man it would have to have been a similar proposition. The proposition built was not similar because it was mutually exclusive. What was originally said could not have been what was said after by the other person.
Here is an example from wikipedia.
Straw man arguments often arise in public debates such as a (hypothetical) prohibition debate:
A: We should relax the laws on beer.
B: 'No, any society with unrestricted access to intoxicants loses its work ethic and goes only for immediate gratification.
The original proposal was to relax laws on beer. Person B has misconstrued/misrepresented this proposal by responding to it as if it had been something like "(we should have...) unrestricted access to intoxicants". It is a logical fallacy because Person A never advocated allowing said unrestricted access to intoxicants.
Note that the straw man built is not what he did. If I say I like blue, and he says I said I like green and only stupid people like green, then its not a straw man. Either its a lie or a mistake, but not a straw man.
As for what else? You were also wrong about his misrepresentation being mutually exclusive.
What he said and what was claimed to be said ARE mutually exclusive. If something is sometimes, it cannot be always. If something is always, it cannot only be sometimes.
Definition of mutually exclusive.
related in such a way that each thing makes the other thing impossible : not able to be true at the same time or to exist together
So no, not wrong. Most is mutually exclusive to ONLY.