1. It looks easier than it is
On average, bartenders probably do 10-12hr shifts, sometimes with no break. There are hours of prep work, hours of clean-up, and hours of catering to the demands of people who have no concept of a bartender's actual hours.
2. Their lives are not an endless party
The bartender is like the parent at a slumber party: they are working to make sure everybody else is having fun, while trying to keep them from getting in too much trouble. And once the kids go to bed, they're up late cleaning the mess.
3. When you're in an environment that's extremely high volume, everything goes out the window
A skilled bartender always wants to make the best drink possible, but in a busy bar there's a balance between meticulous craftsmanship and breakneck efficiency. This is particularly true of inexperienced bartenders who don't have their recipes memorized. If they're slammed with Negroni, Manhattan, and Old Fashioned orders back-to-back, they're immediately in the weeds and will be much less excited to discuss the intricacies of their tiki menu.