You don’t have to be a robot but you do need to know how to apply emotional intelligence (EQ). If you are short of EQ, then work with a coach to develop it and if you still don’t have it then you have to learn how to fake it until you make it.
Reactions matter. It’s a virtuous circle to stay calm and carry on.
People want to work with people who are going to show real but positive emotion regarding regular and especially stressful situations.
Equally, be aware of passive aggressiveness which is a productivity killer and is mistaken as self-regulation. It typically takes the form of team members leisurely ignoring each other and pursuing their own agenda. If you are saying yes to a task but really are saying no, then you should step back and think about other ways to communicate that you would like to do the task differently.
Treat others how you would like to be treated.