I suppose it would depend on who or what is doing the controlling.
Whether the person can control his alcohol consumption or the alcohol controls him.
I’d hazard a guess that falling down drunk, black out, puking your guts out the next morning kind of drunk is over the line.
I believe that recreational use of alcohol controls a person as long as he/she insists that they will not abandon it and cling only to the Christ of The Cross and his Spirit. I believe the "two master" (Mt. 8:24, Lk. 16:13) principle of two opposites applies here, just as it would for avarice (or for gluttony, or gossip, or pornography, etc.)