Morality is subjective.
Morality might be subjective.
The problem with this is that anything is possible. Hitting dogs, barbecuing dogs, punching dolphins is all fine then? We need to consider the victims of our choices, we should act in ways that help others, not harm them.
Morality might be subjective. But that doesn't mean we should keep putting animals in gas chambers for food we don't biologically need. It's just cruel.