I was at a dinner last night with about 10 people, one of whom was black. At some point on a discussion, I said "working is slavery" and the black person got offended. He didn't admit it but he made a big fuzz saying that using the term "slavery" is diminishing the word's meaning etc. He got further saying that I live in a bubble and that I should learn about what happens outside of my bubble. I remained calm but have since been thinking if the fault was mine or what the problem is. Do you think using the term slavery as a metaphor like that shouldn't be used?