Hi.
You ask a question that is just about as personal as it gets, because while some people think there's nothing wrong with porn, others link it to violence against women and all sorts of other social problems--and then there are about a million opinions in between.
Like most things involving sex, feelings on this topic run pretty strong.
Your question doesn't tell me a lot about what's going on with you. But I suggest that if you're wondering about someone else's porn use, you might want to withhold judgement and give yourself some time to form your own opinion on this matter. Pornographic imagery can be very confusing when you're still trying to figure out what you think about your own sexuality and other people's too.
If this is about you yourself looking at porn, I would say that depends on how old you are. While curiosity about porn is certainly normal at any age, it can be disturbing to pursue it before adulthood.
If the issue continues to preoccupy you, maybe bring it up with a trusted adult or a counselor at school, who might be able to put it in perspective.