You're 100% right that alcohol actually increases body temperature!
When it's hot outside, a cold beverage is seen as a great way to cool off. Many adults like to relax with a cold beer on a hot day. But too much beer on a hot day can actually be a bad thing, as you pointed out!
If someone is working or doing strenuous activity on a hot day, they really should drink water (or maybe a sports drink, but alternate with water as well).
Often you'll see people relaxing with a cold beer at the end of a hard day in the hot sun. There are a lot of reasons for this - drinking a beer might help them relax, or they might associate it with the day's work being over and now they can cool off. For some people, it's almost a ritual to have one cold beer after putting in a lot of work in the hot sun.
It's important to stay hydrated with healthy things like water, even if there might be a beer at the end of the day. Anyone who is very hot or shows signs of heat exhaustion or heat stroke should *definitely* stay away from beer or any other alcoholic beverage!
Posted 3016 day ago