We went in and all ordered straightforward drinks (tequila soda, etc.). We thought that given the dive bar nature and the fact that our drinks were not particularly hard to make, a $1 tip per drink was reasonable. Customer service was not anything outstanding. The blonde bartender came back and said in a very condescending manner that 20% is the standard and we need to tip her more. In my opinion, tipping is optional and based off quality of service, and the service we got was not worth 20% of our tab. Their responses to negative reviews on here also say a lot about how they treat customers. Will not come back.