Why do some people in other Christian denominations dislike the Catholic Church?

Because they are desperate to validate their own existence. If they read the Bible (most do), they know that Jesus christ founded only ONE Church, and plainly said it was to remain ONE. If they know anything about the history of Christianity (most don't), they know the Catholic Church is that ONE Church founded by Jesus Christ for all mankind. In other words, if they are honest, they know their unauthorized manmade tradition of thousands of conflicting denominations is not the will of God. But apparently they think that if they can just make the Catholic Church look BAD enough, then maybe, just maybe, the rebellion against Christ's Church that resulted in the doctrinal chaos of their tradition can be justified.