It's also only a dirty trick if you fall for it. I've spent my life being accused of having autism, sometimes it's good to strategically not be aware of social norms like that.
I have never had an issue taking every day I was owed, including taking month-long vacations. I have tried to be sensitive to not taking time off at "bad" times but if I was ever generally told I couldn't take my vacation time I would be interviewing.