I am comparing your use of the word 'genocide' to describe a rebel group because they use under-18 soldiers to dwight accusing a pushy italian-american insurance salesman of being in the mob because he drives an suv.
Not as funny when it needs to be explained, though.
I don't think an apology is warranted when it's apparent a claim is being made as a bad-faith deflection.
Even if you had made a compelling case for your use of the word (you still haven't), it's still in response to someone pointing to a genocide that's already happening. You could've just said 'Houthis are evil because they are using child soldiers' and we wouldn't have anything to talk about (except maybe a debate over whether that changes the ethics of a US-Saudi backed genocide against them), but instead you said "Houthis are using child soldiers", then "Killing children is a form of genocide", and then chose not to elaborate any further, even when pressed.
"It really seems like it to me" is about as satirical as dwight type-casting an italian-american as a mobster.