Boosted by the zoë balkanization project
feels like a hot take, but really shouldn't be; 
For the love of whatever diety you choose to worship, PLEASE treat workers with respect. McDonald's, grocery store, shop in the mall, whatever.
Chances are they make minimum wage, which typically isn't even enough to live above the poverty line. They do /NOT/ have time for your bullshit on top of that.
I don't care if you've had a stressful day, or if you're a single parent, or if you work two jobs to make ends meet, or if they messed up your order, or all of the above. /NONE/ of that gives you the right to ruin someone else's day.
Remember: Wage Slaves are people too.