Lima, as a Catholic I appreciate your strong defense. "Roman Catholic" is not a prejorative ,& about 20 % of the parishes in my city use it in their titles. 

 The fact that the name was bestowed by the Anglicans  centuries ago does not make it invalid. Remember that it was a 'term of equity'. Diminutives should not be used against other Christians,IMHO." Catholic" means universal,& includes all believing Christians.