First, just an aside: you don't have to hate anyone. It doesn't make you a bad person to hate others, but you could be living better, that's for sure. The thing is, it usually mainly impacts the hater, making them unhappy and angry.
But your analogy doesn't fit here... the issue with blue and green bubbles is the social pressure to have the "better" bubble color, to show you're part of the "better" group. That is, the negative social pressure comes from the threat of social exclusion via lower social standing. But the previous poster is also threatening social exclusion, but a more complete exclusion, and based on nearly the same thing. So it would be more like showing your objection to racism by expressing racist ideas or taking racist actions. Doesn't make sense, of course. That's my point.