What is morally objectionable for one person is morally objectionable for all. Subjective (or relative) morality is an error that was condemned by the Church a long time ago. Were it not so, then murder, rape, abortion, stealing, etc... would be sometimes morally permissible and some times not (depending upon the person). This of course is false.
The only room for an exception here is if a person (through ignorance) fails to see a problem with something that is objectively wrong due to an immature conscience which is not fully formed in the Catholic faith.
There are Objective Truths and Subjective truths. Subjective in this sense means that one can "shop around" for an opinion which suits their behavior, but is (from a morally objective view) nonetheless a falsity resulting from a decision based upon a conscience that is not properly formed. This is the state with many laymen and yes, even priests today. A Catholic man who has access to the teachings of the Church (especially one who knows the Catholic faith is the one true faith and who has access to the internet), can not hide behind a "cloud of unknowing" in order to excuse bad choices in entertainment or other modes of behavior.
No examples are needed here, because our present society is so full of situations where people "shop around" for a theology which suits their behavior instead of changing their behavior to suit newly learned truths about God and about man.
It all comes down to this, if a Catholic man says he knows Jesus Christ, and believes that Jesus Christ would not have a problem with entertainment which either exalts sin, degrades the human person, makes a mockery of holy things, or conforms to the spirit of the world, then that Catholic man is fooling himself and does not really know the Master. It's just that simple.
So while, yes... a poorly formed conscience is an excuse, one who has just read these paragraphs can no longer claim to have a poorly formed conscience... See... matter solved if a person makes it to the last sentence here.
I’ve asked my dad many times if it is a sin to lie to save someone’s life. And he answered me in this way: It is never a sin to lie to save someone’s life, but it has to be imminent danger. A lie for any other reason is always a sin.
Related to this, what is a sin for one, is a sin for another (assuming both have a fully grown conscience).
The moment a person pleads ignorance of the truth as an alibi for sin, they are guilty because they show themselves aware that their conscience is in ignorance and have done nothing to form their conscience for the better.