My understanding is.. You get an invite to my house, and then when you walk in, you tell me how much you hate it here. I ask you to leave, and you're surprised. Does that about sum up the interaction?
Superficially it of course makes sense that a business doesn't need to serve people who criticize them. However, social media giants are practically a significant actor in the society, not just a random business down the road, and they should accordingly be held to a higher standard.