Virgil's Aeneid attacked basic Greek ideas. The Greeks were looked upon negatively by the Romans. The Romans disagreed with the Greek ideals, religion, and most importantly-fate. The Romans disagreed with the Greeks on almost every major aspect of the Greek culture.
The Roman ideals differed greatly from those of the ancient Greek. In the eyes of the Romans, the Greek ideal of duty was not nearly as important as the Roman ideal of piety. The Greek ideal of duty was looked down upon by the Romans because the Romans felt that the Greeks would give up on their duty in order to gain something better, for example, personal glory. The Romans felt that duty should be directed toward ones family or country. The Roman piety involved carrying out a given duty, but it involved more respect for others. The Greek ideals were not the only aspect of Greek life that the Romans looked down upon.
The Romans also felt that the Greek way of worship was inferior. While the Romans showed obedience and worship to the gods, the Greeks were submissive and almost fearful to their gods. For example, in The Aeneid, Aneas was obviously not happy with the gods" decision, however he went along with it without complaints. The Romans were much more appreciative of their gods. On the other hand, as seen in Homer's The Odyssey, Odysseus was upset about the gods toying with him, and he actually cursed them on occasion. Since religion was such big issue for the Greeks and Romans, it is obvious how the Romans would look down upon the immoral Greek religion.
Finally, one of the most prevalent themes in The Aeneid is fate. The Romans were very concerned with fate. They believed that one should be happy with the cards he is dealt. The Roman view of fate can be tied in with piety. The Roman piety included respect for fate. The Romans accepted their fate and dealt with in a respectful, pious way. In contrast, the Greeks were constantly trying to change fate.