right. I was gonna say something but... you know. since it was framed as 'not being punk' it kinda completely invalidates tactics based upon their popularity, attributes it to a 'scene' and uniformly assumes the position of all workers in the service industry.
as a tactic it clearly is not meant to target the bosses. even if it was just someone scribbling something unintentionally it speaks to others, it speaks to the worker, and even though it can create resentment- its still resentment against capitalist Work structures. (that is to say even if someone is pissed that someone else wrote something 'vandalized' or they think it's morally wrong, they still recognize that they are coerced to clean it because of a firm work hierarchy, the aesthetic of their workplace, to maintain the marketability of their space, to repress ideas despite the content. someone might even vent about what was written, or the act of writing out in public, with their friend or peer group. we can't really say whether the overall effect is negative or positive. if it's in a space that a particular community, or not, uses it can also be used to communicate to others that resistance in small ways is a current of thought more common than we might think.
it isn't 'work' that wouldn't otherwise be made to do- the level of work is consistent despite the individual task. I've had employers that will create work and make you polish things everyday so that they can justify keeping you on the clock, and having to do meaningless (like seriously uneccessary) things just to fill time so they get as much 'labor' from you as possible during a slow period or whatever. the structure and subordination and humiliation or amount of work is not dependent on us as outsiders (if we are outside that immediate space and community) based on our behavior.
that being said it's probably really fucked up to deal with that shit, especially if the bosses response to changed conditions out of their control, like vandalism, or anything hurtful to their ego, is to take it out on the worker.
personally, working with asshole customers or coworkers or the boss is terrible, it might break up the fucking monotony to have a different task than wiping the counter 30 times or getting them coffee or cleaning the toilet or vomit. in either case, like taking a freeway or disrupting traffic, it may affect people's 'work' but ultimately we can't avoid all disruption (and do we want to?)
there are a couple ways to look at it. do I wanna clean up misogynist shit off the walls? no. id be pissed. but because most fucking scribble is oppressive or racist or sexist or also territorial- i'm not sure i'd write off or villinize communicating the resistance to these ideas on any surface possible.
oh ya but don't yell at people and be horrible at them for no reason idk. confusing.