Is sarcasm a productive form of communication?

Usually I see sarcastic remarks here all the time and when confronting people on it, it never goes well.

Taking them seriously and being charitable leads to them calling me naive and not understanding the sarcasm.

Calling them out on their sarcasm leads to them claiming they're not sarcastic then attacking me for being bad faith.

Considering how common it is not just here, but in internet forums I have a few questions.

1. Do you do it? If so, is it conscious or subconscious?

2. Is it to make fun of the person?

3. Do you feel it's an effective way to teach/educate/communicate?

4. Why do you do it?
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1/3 people so far gave a substantive direct answer, the rest are either trolling or giving blunt reductive answers. This norm that its bad to give complete answers is depressing. AI chat bots are more helpful.
Is sarcasm a productive form of communication?
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