A long time ago, you would only interact with humans from your own tribe. Most of your actions had direct consequences for you, and you interacted with these people every day. Your life and wellbeing depended on that group and your social status. Then came local communities, followed by the global village, with access to eight billion people you will never meet or know. You can say whatever you want to them and face no real consequences, you can simply block them if you wish.