What do you think? Is there such a thing as objective morality? Or is it all what you’ve been taught?

I would say it depends on the perspective. From a whole universe perspective, supernovas don't care much about fraud for example. I've yet to hear a black hole complain about shoplifting. From a human perspective, laws and morality differ from place to place but all human communities have rules and codes of conduct to ensure survival. Without some controls on behaviour, pure anarchy would have long ended our species run. In that way, there is something innate to morality, but, in my opinion, that innate quality is the want and need to form groups. Group dynamics is what is innate and, for those to work, morality is needed.

@Kick & Mersa: the universe thing is a silly argument. The very concept of morality implies conscious choice. Without choice, morality is meaningless. A black hole can neither commit  nor understand fraud unless it is sentient. When it comes to humans, you don’t have to teach a child how to recognize injustice when the injustice happens to them personally. Even psychopaths have a self-centered version of morality. True morality is simply acting out the same rules for both “us” and “them”.

For those who might have become confused by college and need a more erudite explanation... I just summarized the universal formulation of Kantian ethics.

LOL. The only immoral thing you might be able to accuse a rock of is maybe having a bad attitude

Anything that takes action purely based on stimulus and response is amoral.  Morality requires not only the ability to make choices (i.e. not fungus) but also requires that those choices have moral consequences. Choosing between lentil soup and a salad during lunch is an example of a choice with minimal moral consequences. There may be some context under which it has moral implications but most of the time that choice would also be amoral even though it is a conscious choice.

404

To expand on what I wrote, what I mean is that there is no, in my opinion, external forces deciding morality. Things are good and bad because they are good and bad for humans and those judgments are based on subjective human opinions. Outside of human perspective, there is nothing inherently evil about murder. Everything is just the interaction of particles and, as far as I can see, from that perspective, the certain interaction of some particles is no different from another interaction on a universal scale.

Also from my perspective, there are no consequences outside of human society for evil behaviour; I don't believe in Heaven or Hell or karma. I don't believe that written into the atoms of the universe there is a code of ethics, all are constructed by humans (and arguably some other non-human persons...). Because I don't believe in some universal rulebook, I argue that we should constantly be reevaluating what is good and bad because what is judged good and bad can change due to circumstance. We have to evaluate what is the best course of action in response to all of the available information. The Golden Rule and the Harm Principle of John Stuart Mill are, in my opinion, some of the best thinking we have on morality, but again, whether you break these rules, will have no effect except in human society. Morality is entirely man-made but there are lots of things that are man-made that are great like cheesecake so it's no loss that it isn't a fixed universal constant.

I think you are oversimplifying the golden rule. The dirty vs clean argument does not undermine the golden rule; it simply forces it to a new level. If dirty means disrespectful to someone, then you can try to present yourself in a respectful way by taking a shower if you already understand that the two are connected in their mind. Likewise if the dirty person is unaware of the connection between respect and cleanliness due to cultural differences, then there is room for “Mr. Clean” to voluntarily disassociate cleanliness with respect out of respect for the dirty person’s cultural perspective. Now the golden rule only pushes both parties towards mutual respect and patience and understanding instead of forcing one person to take a shower