They absolutely can be. You can push back against your manager.

Still, you'd rather save your push back privileges - which come with a cost - for something actually important and work-related. Not for random crap like that, being put on the spot randomly in a personal way.

Use it and get more pushback power plus get caution when manager approaches. Getting labelled get can benefits and negatives.

I said no to things and world did not ended. You absolutely can say no. If you can't, you need to change the team or job.