First off, even when wrong the crew is always right.
In my experience this year flight attendants have been rather parsimonious with drinks—-and not just on Alaska. Seriously I had to beg AA crew for water PHX-SFO.
I recently flew UA in Polaris EWR-ZRH…three drinks for the whole flight. (When I ordered a fourth drink, a Coke Zero I might add, the flight attendant made a comment about having too
much fluid before landing.)
My point: crew on all airlines are stressed which impacts service quality. Alaska delegates more authority to the front line, which usually is good in my book. In this case there might be a policy made up by an individual flight attendant…but either way as a passenger requesting alcohol it is at the discretion of crew.