Yes, getting drunk is a sin.
It is along with
Galatians 5:19-21
Results of the Sinful Nature
When you follow the desires of your sinful nature, the results are very clear: sexual immorality, impurity, lustful pleasures, idolatry, sorcery, hostility, quarreling, jealousy, outbursts of anger, selfish ambition, dissension, division, envy, drunkenness, wild parties, and other sins like these. Let me tell you again, as I have before, that anyone living that sort of life will not inherit the Kingdom of God.
1 Corinthians 6:9-11
Don’t you realize that those who do wrong will not inherit the Kingdom of God? Don’t fool yourselves. Those who indulge in sexual sin, or who worship idols, or commit adultery, or are male prostitutes, or practice homosexuality, or are thieves, or greedy people, or drunkards, or are abusive, or cheat people—none of these will inherit the Kingdom of God. Some of you were once like that. But you were cleansed; you were made holy; you were made right with God by calling on the name of the Lord Jesus Christ and by the Spirit of our God.
Whatever our weakness is, the consequences are the same for us and those around us.
We tend to grade sin, truth is in the eyes of God sin is sin.
Truth is we can't grade sin, Jesus died full stop for our sins.
When we look at addictions drugs/aclochol top the list and we become quick to judge.
Yet we don't judge things like addiction to caffeine, I need my coffee before I can function, addiction to food, addiction to shopping and so on.
Yes getting drunk can lead us down a route that causes further sins, like being promiscuous, getting into fights.
All of the above mentioned in Galatians and Corinthians lead to further sins that have consequences for those we sin against.
If I cheat someone once, then I can do it again, in doing so we are sinning against the person we have cheated.
I think if we truly knew that we were once like this but are cleansed and trust in Jesus to be set free then we can walk in that freedom. I also believe that if we still struggle and don't want to walk this way then we are still a child of the Father and will spend eternity with him.