Not OP, but I don’t think they mean that the Tea Party was part of class solidarity, but more that it was a movement that was unorchestrated by the powers that be and could, if left unanswered, lead to threatening the status quo, aka super wealthy.

This is probably the most hilarious overreaction I've seen in a while.

I don’t know what you mean by “class solidarity,” but it was born in the fires of the 2008/2009 bank bailouts in which millions of ordinary people were wiped out financially while the financial institutions were given trillions of dollars. There was a lot of anger at the perception of crony capitalism and elites. The movement itself was grassroots and clearly feared by the powerful. You might not like the goals of the movement, but their anger was palpable, and at one point, something like 10% of the country identified with the movement. There was no way the rich and powerful could let ordinary citizens form such a powerful voting bloc.