Obviously some will argue that there are no evil acts, as yourself, that doesn't mean that certain acts aren't evil. Some people might not comprehend that some individuals deliberately does evil acts, they enjoy the suffering of others. And yes these individuals exists, to the highest degree, infact I almost walked that path myself. And we're not talking about giving someone a wedgy, we're talking about ending someones life for the sake of hate, suffering and personal enjoyment.
These individuals have other sides aswell ofc, but once you encounter what some experience every day, you'll certainly not say evil is subjective...
Good and evil are a matter of religious and social perspective. It depends to what the majority in any society considers "right" and "wrong".
Examples:1) Infidelity. If you are married and your wife has been loyal to you for, say, 10 years, if you cheat on her repeatedly, with personal pleasure in mind, then those around you will consider you evil, and, if not evil, they will think you're doing the wrong thing.
That is, if you're living in a WESTERN christian society. Cause if you're a muslim, you can have 2 wives, and the whole idea of infidelity looses it's meaning.
2) Suicide. If you kill yourself because you can't bear the burden of shame, for example, people in western society will consider you weak. Some will even say that you deserved to die, and that you are burning in hell as an evil person. Others will consider you selfish, because you thought only of yourself, and left those around you to suffer. But, if you lived in japan, then you would be considered an extremely honorable person.
3) Murder or sadism. Today, both of these ideas are considered evil, almost globally. Thousands of years ago, pharaohs could kill anyone without ever being considered evil when doing so. Or, during the dark ages, people died in extremely sadistic ways, since they were considered "evil" by the church, and the act of killing them was considered noble.
My point being that what is evil depends on the social concept surrounding the act, the nature of society in which the act is performed and the religious beliefs of that said society. It does not depend on the act itself. There is nothing beyond that, and evil and good are created ideas, whose concept may easily change in the future. Therefore, morality is relative and we can only speak about good an evil when we live in the same society and have accepted the same laws and moral codes. In that case, morality is not subjective, because it is dictated by the standards of that society, and therefore we can say that there are absolute moral values.