This is actually part two of a short series. Here's part one. The first video focuses on the reaction to the work of feminist Anita Sarkeesian, but this video makes some more general, interesting points about why simple remarks like "I'm an atheist" or "I don't drink" can sometimes offend people.
I think this analysis is very helpful for personal introspection re-evaluation of one's opinions, and also for understanding the reactions that you will often get for discussing particular kinds of issues both online and offline.