I'm Roman Catholic, and it's not uncommon to use the term to describe the Church in mixed company to prevent the connotations and implications mentioned in the answers by wax eagle and lonesomeday. Official documents from parishes, dioceses, and even the Vatican use the term "Roman Catholic Church" interchangeably with the Catholic Church, particularly when the audience is not primarily the Roman Catholic Church and the term "Catholic Church" is ambiguous.
For example, when the Holy Father visited Poland to meet with the heads of other Churches, he said (emphasis mine):
As I recalled during last year’s ecumenical encounter in Cologne: “We can only obtain unity as a gift of the Holy Spirit.” For this reason, our ecumenical aspirations must be steeped in prayer, in mutual forgiveness and in the holiness of life of each of us. I express my satisfaction at the fact that here in Poland, the Polish Council for Ecumenism and the Roman Catholic Church have launched numerous initiatives in this area.
When he met with the Archbishop of Canterbury he said:
Since that meeting, the Roman Catholic Church and the Anglican Communion have entered into a process of fruitful dialogue, which has been marked by the discovery of significant elements of shared faith and a desire to give expression, through joint prayer, witness and service, to that which we hold in common. Over thirty-five years, the Anglican - Roman Catholic International Commission (ARCIC) has produced a number of important documents which seek to articulate the faith we share.
I think in keeping with common practice, and in the spirit of ecumenism and to prevent ambiguity, it's important we don't refer to only one group as the the Catholic Church.