The Catholic Church is free to remove disruptive protestors of any stripe from private Church property. A priest officiating over a Mass at which something like this happens should instantly order the protesters to leave, and if they don't respond by heading for the door instantly, the priest should direct worshippers to forcibly apprehend them and hold them for police. Police should be called, trespassing charges lodged, and civil damages sued for. A tough approach to this uncivilized behavior is needed, and frankly I've never heard of the Catholic Church taking any serious action at all in such cases. Can't fathom why not, but if you let people walk all over you with impunity, they'll keep doing it.
In this case they were escorted out, since then, this couple has sued to have "hate speech" outlawed. (grrrrr) and one of this very couple is now running for office here. Nice! Just the kind of person the Congress needs......NOT