Junior associate brought alcohol as a white elephant gift. Did I overreact?

A few years back, there was an incident which resulted in a ban on alcoholic beverages at my firm. Only partners and a few senior associates are allowed to have alcohol on the premises. My firm's employee handbook and policy manual clearly states this, and all new associates are required to sign a document saying they received the employee handbook and policy manual, and will read it.

We did a white elephant exchange today, and a bottle of alcoholic eggnog was included by a brand new junior associate.

I just said, "It's against policy to have alcohol at the firm." I just wanted to let them know, and I wasn't even planning on doing anything about it. Then somebody else said that wasn't a rule, and then I showed them the policy, then they told me to stop being the Grinch (I wasn't going to do anything about, and don't even have the power to, I was just telling them it was against the policy).

One of the partners said I was right, but they'd make an exception for this. Then throughout the day people were making jokes about how I probably called the cops on my grandma when she was driving drunk.

Did I overreact? All I did was state a true fact.