[TiK]

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I also saw her pour my Guinness, walk off, and pass by the pint about 6 times before finally giving it to me 5 minutes later after I had to get her attention.

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You can't pour Guiness in one pour. Could it be that she was waiting for it to settle before she finished the pour? Also, if the bar is busy, bartenders'll pour half, wait for it to settle and do other things while they wait, and then come back and finish.

Now that I think of it regarding your tequila issue, I do think the bartender was chilling it by putting it in a shaker with ice and shaking it a bit, which will most definitely water down your tequila.