And it scandalizes everyone else that the host and the tenant not only are different people but apparently agree and potentially disagree about various subjects.

And both host and tenant explain that they lived through the European Middle Ages, and given the state of literature at the time, the only way they survived with their sanity intact was the ability to talk with each other and drink copious amounts of beer.

Even Daniel has to agree with that.

Methos was smart enough to get himself to China or some more civilized area for that time period.