I think that after word choice/natural usage, emotional expressiveness is the hardest thing to pick up as a foreign language learner. I feel like it isn’t taught in any kind of useful way and very difficult to correct/change once habits set in.
And there are multiple levels, right, and theoretically you’d want to drill “OK I’m miffed but not enough to speak to your manager about it” and also “You will stop that, immediately, or I will call the police.”