I'm at a loss as to how I could successfully explain the difference to someone who is clearly full of shit and doesn't himself understand the difference.
There's really nothing to explain: You quoted a contradiction. You then typed the non sequitur "law of excluded middle"; I take it we were supposed to infer that the quote is false because of excluded middle. However, the quote is false because it is a contradiction, not because of excluded middle.
I can alter the quote so it is false because of excluded middle:
> did not demand
> the request is currently not "optional"
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