There is no convincing them to change their behavior because it’s an emotional reaction they backfill with paper thin logical.

These are people who, if given a position where they determined employees wages they would pay the bare minimum. The temporarily embarrassed millionaire mindset, class traitors, etc.

If they were approaching this from a truly moral position they would boycot establishments where tipping is expected. Instead they freeload and feel entitled to a server paid the literal minimum wage.