"the Moors are a tricky lot; they don't hold with drink"
Berber warriors in a show in Agadir, Morocco.
Public DomainBerber warriors in a show in Agadir, Morocco. - Credit: Notwist, Wikimedia Commons

The term Moors is open to various interpretations:

Originally, it was used as an alternative term for the Berbers, the indigenous people of North Africa;

It may also be used to describe people of Moroccan origin who live in Europe, or to describe any person from North Africa. It is now often considered an offensive and pejorative term.

The predominant religion in North Africa is Islam which forbids the consumption of alcohol and other intoxicants; hence, the Consul's comment that they don't hold with drink.