The definition of graffiti from the dictionary says its "writing or drawings scribbled, scratched, or sprayed illicitly on a wall." the dictionary also says that it does come from the greek word to write. IT also then goes on to say that if we want to go back to how it was used we'd have to use it like the word "writing" which we can all agree wont happen. It no longer means that in todays world.

To be graffiti wouldnt IT have to be done illicitly*

to be graffiti wouldnt have to be done illicitly (i mean by definition yes) at what point is this just considered a mural and not graffiti. I mean a cops standing there in the picture letting it happen so is it graffiti.

I agree they should have at least talked to the manager first but still the restaurant complete overreacted. I work in the restaurant industry in a state where we make less then minimum wage but thats not an excuse for poor service. Tips are tips they're not mandatory. it seems like the waitress exploited the automatic gratuity.

As for "snotty foreigners" ive dealt with that too but you're being ignorant in assuming every culture follows america's standards for tipping. In korea and many asian countries its considered very rude and disrespectful to tip because they feel like its there job to serve you well. In many european countries youre suppose to tip but its not taboo not to, its based on how well the server did in your opinion.