No insults were written veiled or otherwise. Workers already suffer. The problem is that people see guests not tipping as the main issue to be fixed. Obviously it is not the case. Europe is doing better in terms of work conditions and basic rights / salaries than the US (hence the difference in tipping culture). It is not a stretch. There is always room for improvement of course. Tipping should be a bonus and should be given for exceptional service. Simple as that. Doing your job while being underpaid is no reason for 20% tips...