That's pretty fucked up. I always thought of "Teamwork makes the dream work" as something two people working together might say to each other once they finished a task more easily than they could have alone. A boss saying that to an employee is definitely saying "we (management) have a dream that you should turn into a reality for us".

Motivational posters are the worst. I've never worked at a place that had them that didn't have their head up their asses.

Want to motivate me? Give me good wages, lots of vacation and keep the shitheads out of the company. Current place puts a premium on culture fit, anyone can interview, if any single person is uncomfortable, they're a no-go. We've had some solid talent booted out the door because they couldn't stop from being as ass for a couple hours.