I think you're being way too generous. Intolerance is very common. It's not all rodney king or massacres or horrendous brutality. It is often idle and minor abuses, that are just quiet enough to be socially acceptable. They do just enough to be able to get away with it. Those that do more than that, obviously don't get away with it.

For example, when an angry poor person says "welcome to reality" to a small child who gets mistreated and tries to defend themselves. That is a form of intolerance. And it's a common saying and widely used.

I guess it's not directly tied to any demographic. But it is generally hateful behavior. Maybe it's more just an attitude of intolerance, and melodrama. By your definition, tolerance is allowing something to exist without interference. So in this example, they would be interfering with someone's right to defend themselves, or to experience happiness.

I guess you probably didn't make this comment with the hopes of being disproven or argued with. And I'm sorry for doing that. But I do honestly think you might be mistaken.