> Moral relativism is not as promising a position as most ordinary (non-religious) people believe. The majority of trained ethicists (in the field of Philosophy) are moral realists: they believe that certain things are actually right and wrong.
This is a poor argument because response to it is just that that is selection bias. Those who settle on moral relativism don't become ethicists (since there's nothing much to say on that, they specialize in something else) and those who do become ethicists can't settle on moral relativism (since again, there would be nothing much to say and they'd have no job.) Or take it the other way: in order to be an ethicists, you'd have to be a moral realist. Something along these lines anyway waves hands.
> since there's nothing much to say on that, they specialize in something else
This is not really true. There are plenty of different forms of relativism and plenty of philosophers who have taken a stance in ethics that is consistently anti-realist and published countless papers defending various aspects of that.
It's more or less the same argument as "all climate scientists believe in climate change because they have to or they wouldn't be able to publish anything, therefore we should discount what they say about climate change". Except in this case it's even weaker, because a significant proportion (though a minority) of ethicists take this position.
This is a poor argument because response to it is just that that is selection bias. Those who settle on moral relativism don't become ethicists (since there's nothing much to say on that, they specialize in something else) and those who do become ethicists can't settle on moral relativism (since again, there would be nothing much to say and they'd have no job.) Or take it the other way: in order to be an ethicists, you'd have to be a moral realist. Something along these lines anyway waves hands.