I’ve been arguing with a self-described Nihilist who refuses to recognize any ethical absolutes. He’s a true cynic who insists that moral rights and wrongs are entirely subjective. It’s difficult to argue with such a constantly moving target.
I doubt the value of ever discussing anything with a nihilist, unless you are a philosophical pathologist collecting specimens. If that is what you are doing, then you might try asking Nihilist if he is saying there are no absolutes. If he answers, “Yes!” – then he has just contradicted himself by stating an absolute.
Then you will find out whether he is honest, that is, facing reality or evading it. If he isn’t, surely you must have better things to do in life.
P. S. – Did you ask him what he means by “subjective” – and whether that meaning is itself subjective?
P. S. 2 – Is he saying there are no absolutes only in the realm of ethics, or everywhere? Again, you might ask him what he means by “absolute.” In Objectivism it apparently has two meanings, depending on context. First, in an ontological (metaphysical) context, it means “necessitated by the nature of existence and, therefore, unchangeable by human agency.” (Leonard Peikoff, Objectivism: The Philosophy of Ayn Rand, p. 24)
Second, “absolute” (as in “contextual absolute”) means an idea that is “an immutable truth within the specified context.” (Peikoff, OPAR, p. 174.
The way I think of absolute – for epistemological and other, higher contexts – is that it means this: applicable, without exception, to a given context. So, if the question is – Are there moral absolutes? – the answer is: Absolutely! “Murder is wrong” is an example that applies fully in a normal, civilized context.
There are many absolutes in morality. Philosophical values of reason, purpose, and self-esteem are absolutes. The virtues are absolutes. That is a lot of absolutes and they cover all human action.