But then someone reminded me of this:
Now the publicans and sinners drew near unto him to hear him. And the Pharisees and the scribes murmured, saying: This man receiveth sinners and eateth with them.
And that reminded me of this:
And the Pharisee, who had invited him, seeing it, spoke within himself, saying: This man, if he were if a prophet, would know surely who and what manner of woman this is that toucheth him, that she is a sinner.
I think that these passages are appropriate rejoinders, and the occasion represents a teaching moment: if certain Protestants treat one of their own in this way, we should not be surprised if they likewise think the worst of us Catholics. If they can't "do unto others as you would have them do unto you" with respect to their comrades, it's a fool's errand to hope that they will show any respect to us. It's sad, but there it is.