That is what someone with no ethics says. Ethics are quite objective. But I don't have time to go off on that tangent with you which you can begin by
unconflating morality and ethics.
There is something objective, and I can expand on this if you want to learn about it (it extends to re-writing game theory to account for un-factored costs that have gone unnoticed for decades) but it's on a layer that is untouched by 99.9999% of the population. So, for the intended discussion, and since for the public at large ethics are "shoulds", I will just quote your link:
=>
Although the terms morality and ethics are sometimes used synonymously, it is useful to adopt the following distinction:
Morality is descriptive, it is concerned with social norms and peoples moral intuitions. Ethics on the other hand is normative; it doesnt describe how people act, but how they should act (this still requires a clarification for the word should!).