Careful, they can fire you for NO reason, but they can't fire you for ANY reason.

Can you imagine the fallout for firing an employee for discussing salary after the recent NyTimes article? It'd be PR suicide.

Now, your relationship with your manager might be strained, but hey, that's life.

I don't think employees in (most?) at-will states can be terminated for violating pay secrecy rules.

(I think the only state with a meaningful divergence from at-will is Montana).

But not any reason.

At the same time, firing right after talking about salary is extremely suspicious.