ETA - Just to clarify - I was responding to @stpurl , but whilst still typing my reply
@Tis_Bearself replied - which I did not see.
I normally like a lot of your posts. I can’t say the same for the ones in this thread.
I too am a firm believer of say the black, do the red. I have changed parishes simply due to the issues you have raised in this thread. Incrementalism is a problem.
But as this thread is based on the title and opening post, I wished to include the possibility that it could be a legit custom of that parish, or it may be on the way to being a legit custom of that place.
This is the full section from Canon Law-
TITLE II: CUSTOM (Cann. 23 - 28)
Can. 23 A custom introduced by a community of the faithful has the force of law only if it has been approved by the legislator, in accordance with the following canons.
Can. 24 §1 No custom which is contrary to divine law can acquire the force of law.
§2 A custom which is contrary to or apart from canon law, cannot acquire the force of law unless it is reasonable; a custom which is expressly reprobated in the law is not reasonable.
Can. 25 No custom acquires the force of law unless it has been observed, with the intention of introducing a law, by a community capable at least of receiving a law.
Can. 26 Unless it has been specifically approved by the competent legislator, a custom which is contrary to the canon law currently in force, or is apart from the canon law,
acquires the force of law only when it has been lawfully observed for a period of thirty continuous and complete years. Only a centennial or immemorial custom can prevail over a canonical law which carries a clause forbidding future customs.
Can. 27 Custom is the best interpreter of laws.
Can. 28 Without prejudice to the provisions of can. 5, a custom, whether contrary to or apart from the law, is revoked by a contrary custom or law. But unless the law makes express mention of them, it does not revoke centennial or immemorial customs, nor does a universal law revoke particular customs.
So whilst we may not agree with what is occurring in that Parish, my reading of the above, provides for such things to become custom once it’s been approved by the competent legislator.