That would have been a very fair point but to me, the tone definitely comes off as "how dare these annoying waiters try to sell me coffee so that the shop doesn't lose money from me occupying a seat" and "how dare teenagers enjoy their time in a coffee shop, don't they know I have work to do?"

English isn’t my first language, so some sentences may have lost their nuance in translation. To me, that paragraph was more of a humorous, playful way of listing the aspects of working in a coffee shop that don’t suit me, rather than an angry, dissatisfied complaint.

I read that as more of a tongue in cheek recognition that coffee shops need a certain revenue per seat per hour, which isn’t a fault as much as not being what a remote worker is looking for.

That says a lot about you.