Satan hates the cross in all its forms. The Church has known this for a long, long time:
Let us, therefore, not be ashamed of the Cross of Christ; but though another hide it, do thou openly seal it upon thy forehead, that the devils may behold the royal sign and flee trembling far away. Make then this sign at eating and drinking, at sitting, at lying down, at rising up, at speaking, at walking: in a word, at every act.
St. Cyril, Bishop of Jerusalem (d. A.D. 386)
***Satan hates the cross in all its forms. The Church has known this for a long, long time: ***
Excellent point. satan and all his minions whether witting or unwitting are at war with the Cross.
The satanists even have tried to usurp the upside down Cross of St. Peter. Discouraging people from the sign of the Cross is just another inroad into leading Christianity away from the Via of Christ.
The late Bishop Fulton Sheen would often say "the essence of the demonic is the hatred of the cross of Christ"