He didn't get called out. He got harassed excessively. People with no interest in a language they've never heard of suddenly began venting irrational rage at a guy for suggesting that a language article might not be notable.

The solution to a wiki page being marked AfD is to improve the article with useful citations or discuss why the current citations are enough to verify the article.

It's not to stalk both online and offline the person who suggested a discussion should be had on the notability of a topic.