While true-- quickly responding in an offended fashion can be a strong signal of your commitment to group identity and values[1]-- that doesn't really relate to what this post is talking about. This post is talking about the best way to acquire correct beliefs, not the best way to manipulate people. And while getting offended can be a very effective way to manipulate people-- and hence a tactic that is unfortunately often reinforced-- it is usually actively detrimental for acquiring correct beliefs.

Getting offended gives you a reputation that tends to stop people being rude to you and treating you badly. You punish perpetrators by ditching them. They are less likely to abuse you in the future - and so are onlookers. Being the victim of verbal abuse doesn't help much with acquiring correct beliefs either.