I have to admit here that I have some sympathy with your wife. However, I think she is incorrect (based on the facts you have given us).
I’m not a big drinker. I’ve always taken medications (Birth control, anti-anxiety meds) that exaggerate the effects of alcohol so I rarely drink and if so, tend to have 1 only.
My husband is more like you. He enjoys a good microbrew or whiskey and coke after work and likes to keep the house stocked with interesting choices. I notice when he gets stressed after a hard day he tends to drink more.
And I admit sometimes I think “wow, he went through those beers in a week?”
But really it’s because I am just comparing his habits to my own. It’s not all that unusual to go through a six-pack in a week or a bottle of whiskey a month. But because I NEVER do that, I tend to think of it as “drinking a lot.”
If your wife is like me, she might be doing an unfair comparison. One drink gets me buzzed, two and I’m drunk. For my husband, maybe 4 drinks gets him a little buzzed. There’s a big difference in body chemistry and tolerance, and that can be easy to forget.
Talk to her without dismissing her concerns. Ask her why she thinks it might be a problem, or what her fears are. It may be that she is noticing a regular behavior and is just afraid of the slippery slope. She may be pushing her own issues with alcohol on you, or she may be afraid of you turning into your father. Those are legitimate concerns, and you should let her know where you stand and why those fears are not going to come true.
It’s tempting to say “that’s silly, stop nagging me about it!” But for her, the worries will still be there. Address them up front and try to come up with a way you can both see the other’s side.
Whenever I start to think “He’s had a lot to drink this week!” I try to step back and say: “How much has he actually drank? Is that normal for him, and am I just thinking that because I haven’t had any of the beer and it’s all gone after a week?”
I hope you can both work this out.