The OP states that « the reasoning is that ‘barbarian’ means uncivilized or uncultured - it’s derogatory. »Was it? I'm not entirely sure. All the OP says is that Barbarian is perhaps not the best name for the class. There could be a whole lot of other reasons for that: eg. not being accurate for people who want to reskin the class an angry civilised person, not encompassing many types of characters people associate with barbarians, etc.
now, there are more reasons to revisit ‘barbarian’ than it being potentially sensitive. I bet we’d have the same discussion about ‘monk’. But as I understand it, the premise of the thread was « barbarian is derogatory - what would you propose instead. »
personally, I think RPG community gave the barbarian an identity that has moved past its derogatory baggage, but the term does have baggage, and I believe that what’s prompted this thread.