I've worked a few times in Germany for onboarding new teams for a company I worked at previously. It's pretty normal to have some lunches with a beer, beer is a very cultural thing for Germans and having a beer during a lunch out with the team is completely normal, no one is impaired, no one is drinking 2-3 liters of beer in one sitting. Even here in Sweden where alcohol drinking is much more frowned upon I've had lunches (usually on Fridays) with my teams where we would have a beer or two.

There are very different degrees of what and how much to drink, it can be a socially responsible and enjoyable activity, it's relaxing to let go from the whole super-professional office culture and have a beer and cheers with colleagues.

The world isn't black-and-white.