This can be dangerous advice. The recent article about the girl that tweeted something that was considered by others to be racist makes me very wary of increasing my online cross-section. You literally can never know whether someone will take something you share, go on over to 4chan, and whip a ton of people into a doxxing storm over it.
No, that is terrible advicc! Saying "you should never do X because someone cold misinterpret it and bad stuff could happen" will lead to never doing X, or anything else for that matter. You just have to take that risk n real life that people might disagree with you, not understand you, or just not care. See the point about trolls in the article.