If someone chooses to ignore Paul, that is up to them. It is a free world, as they say!  But what I can say is that the apostles of Jesus considered Paul an inspired minister to the Gentiles.  In 2 Peter 3:16, Peter tells us that some of the writings of Paul were “Scripture.”  He also tells us that those who ignore Paul  do so “to their own destruction.”  We know that at the “Council in Jerusalem,” (Acts 15), Paul was given the right hand of fellowship by all the apostles, as well as by James, the brother of Jesus.  It is true that there is no passage in the New Testament in which Paul is called an apostle, other than the writings of Paul, so we can debate the title if we like.  However, in his inspired writings (as Peter said), Paul identifies himself as an apostle, and his writings were accepted by the apostles as Scripture.

Personally, I think that it is a VERY bad idea to disregard Romans.  It is also true, that from the very late first century (Letter of Clement of Rome), and the early second century (Polycarp, Ignatius, etc.), all the church leaders considered Paul an apostle and his writings to be inspired.  For this reason, I would not pay any attention to this person who is advising you to “disregard Romans.”