Why are some people online so afraid to speak plainly when they get into arguments with you?

I'm talking about the type of person who keeps using like weird metaphors or analogies or using really obscure words that almost nobody uses instead of just saying what they mean upfront. Like they're trying way too hard to seem more intelligent than they actually are. And their responses have very little to do with the topic at hand, if at all.

Like the interaction will go something like this:

Them: You're like a little mouse stuck in a precarious maze. You will surely be flabbergasted. It will be unpropitious indeed.

Me: Huh? What does that even have to do with anything?

Them: They say humans are supposed to be way more whip-smart than monkeys and dolphins, but I don't think that applies here.

Me: ... What?

Them: You are indubitably stuck in a dark void. Lightning will wallop you one day for sure. The inevitable will 100% cause a lot of ruin and anguish.

Me: Okay... I'ma stop replying to you. It's not worth it.

And the topic could be about ANYTHING really. Disagreement over a TV show, favorite food, philosphical views, political views, different lifestyles, etc. Their responses don't even have anything to do with the topic at hand and are mostly just weird roundabout ways to insult my intelligence.

To be clear, it's not always exactly like the example above. Similar yes, but not exact. The example above is a case of a especially explicit example, not the most common example.

Not sure if you guys encounter this often, but I certainly do, and it's extremely annoying!

TL;DR You know. The type of people who keep using really obscure words and weird analogies to insult your intelligence, that have nothing to do with the topic at hand.

Why are some people online so afraid to speak plainly when they get into arguments with you?
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