Yes drinking alcohol does kill gut bacteria.
Alcohol has the great ability at killing bad bacteria which is good but alcohol can also kill good and beneficial bacteria which is bad.
The good thing about consuming alcohol in moderation is that the alcohol can kill of bad bacteria and viruses such as the norovirus and Salmonella.
If you have the Norovirus or Salmonella drinking some alcohol can help kill that bacteria and viruses and help you recover quicker.
Alcohol may also help you get over a cold or flu virus much faster as well.
Alcohol in moderation may help prevent kidney disease and help prevent kidney stones.