EN World's rules are broad and vague for a reason - if you hadn't noticed, for any set of hard and fast rules, you'll find a ton of people who will try to game those rules. If we produce a list of specific things that are clearly 100% actionable, folks will argue whether their particular post matches the list.
So, we don't go there. The rules are general, and will stay that way.
If you honestly think it is offensive, report it, and walk away from the thread. Possibly put the poster in question on Ignore, if you feel so inclined.