You guys go to bars very different from those I frequent. lol But still, experts say the main reasons are what I said. Sure, if you drink to excess and your judgement is impaired, that's a contributor. And if any place knows about bars, it's got to be Wisconsin! lol
https://www.emed.wisc.edu/jeff-pothof-md
"“The highest risk environments would be indoors with poor air/HVAC systems, with an inability to maintain 6-foot spacing accompanied by loud talking or yelling without everyone wearing a mask,”
Dr. Jeff Pothof, the chief quality officer at UW Health in Madison, Wisconsin, told Healthline. “The most common example would be a crowded bar with people having to speak loudly because of the noise and either unmasked or frequently removing the mask to eat or drink.”