How would you answer a priest who states that (with the exception of children) only Confirmed Catholics should attend Mass? In other words non-Catholics aren't welcome to attend Mass.
To me that is wrong on so many levels. We should welcome all who wish to attend Catholic Mass whatever their faith (or not). I know several Catholic converts who became Catholic because, as non-Catholics, they attended Catholic Mass on and off over a period of years.
Are there any specific teachings or documents that clearly state that all are welcome to attend a Catholic Mass?