After all, it would make sense that a starship captain would have at least some training in diplomacy, or at the very least in basic courtesies.
Not in the 22nd century. That's not established.
Not even when Tucker said ``You're a trained diplomat'' to Archer that episode.
Besides, who could really foresee something like a dog peeing on a tree, or people taking public urination on a symbolically important item as offensive? These are totally whacked out impossible developments far less likely than Archer deciding to take Porthos on a landing party for the first time in a year.