I drink on average about zero drinks per week, though this sometimes goes up to as high as 4 if I'm being very social. Rarely is it ever higher than that. I never have more than 3 drinks in a single sitting. Most functional educated adults I know are about the same.
What does alcoholism look like? It varies a lot. My brother is an alcoholic and an addict. If he had money for it, he would be drunk essentially 24/7, and there have been many times when he would drink himself to the point of ending up in the ER or equivalent only to wake up 12 hours later and immediately start drinking again. Even when he is "functional" (as in he can hold down a job in construction), he still drinks about a six pack every evening. I do not expect him to see 40 and am honestly surprised he's still alive at 33.
Then there's my sister. She is an alcoholic but doesn't realize it. She is poor and so she doesn't have the money to booze it up as much as she would like, but if she did, she'd probably put down 6+ drinks every single night. As it is, even being poor she still goes out probably 3-4 times per week and has 3+ drinks every time. She cannot ever let alcohol go to waste, so even if there is just a little bit of beer left in a glass that has been siting awhile, she will down it. She also does not seem to have any concept of cutting oneself off. She just keeps drinking until she either falls asleep or doesn't feel like drinking any more. She thinks it's bizarre to not want to go out a bare minimum of twice per week. If you met her you would not guess any of this though. She has no problem going alcohol free during the day or even going days without drinking at all.
My grandfather would go long periods of time without consuming a single drop of alcohol, but then when he did, he'd consume nothing but alcohol for days, sometimes up to two weeks at a time. He died from it.
Regardless of what anyone tells you, alcohol is poison and is absolutely not good for you. How bad it is for you will vary depending largely on how your specific body metabolizes acetaldehyde, but it doesn't change the fact alcohol is bad for you. Everyone can make up their own decision as to how much they want to consume, but less is going to be better, and personally, I would not want to have a close relationship with anyone who drank more than ~5 drinks per week.