Yes but being that these are interns, it’s most likely professional work and not some blue collar job.
It wasn’t the complaining, it was the ‘organizing’ that they did. They formed a coalition to increase the threat to management...standard community organizing bullshit. I would not have even given them the polite meeting room firing. I would have had security guards drag them out and beat them in the parking lot, and wizz all over their boxes of personal belongings so they would take away an extra memory.
Yes, I would have been happy all my life going to work in jean shorts and a tee shirt, but I was a manager in a professional field and had to dress accordingly. I did like to wear a nice suit to meetings though.