Just because you are not responsible for the exploitive system, does not absolve you from using it to benifit yourself, at the cost of a fellow worker. This is an act of violence against the working class and makes you a class traitor.
Is the tipped minimum wage an abusive and explotive system? Yes. Does this mean the owners who use it are explotive and abusive? Yes. Should the system be changed? Abso-fucking-lutly. Does this mean if you don't tip you are also exploiting the servers labor and directly harming them? Yes.