It is worth noting that the presence of the Lord is not the only criteria. For example, if your priest was carrying a copy of the Gospels, he is not supposed to genuflect (Ceremonial of Bishops #70).
Yes, “I swear to God” is a practice to be avoided (CCC 2149), but if the use was neither a false oath or an attempt at magic, it wasn’t a direct offense against the 2nd Commandment.
Personally, I follow Jesuit spiritual exercises. By the time I’ve finished the Examen, I’m so busy contemplating my own, always numerous, failures as a Christian for any given day that I seldom worry about those of others. But if you feel compelled in this matter, the Catechism quotes St. Ignatius of Loyola’s advice on how to approach it:
"To avoid rash judgment, everyone should be careful to interpret insofar as possible his neighbor’s thoughts, words, and deeds in a favorable way:
<<Every good Christian ought to be more ready to give a favorable interpretation to another’s statement than to condemn it. But if he cannot do so, let him ask how the other understands it. And if the latter understands it badly, let the former correct him with love. If that does not suffice, let the Christian try all suitable ways to bring the other to a correct interpretation so that he may be saved.>>" - CCC 2478, quoting St. Ignatius of Loyola
Priests definitely need our prayers. They carry heavy burdens that we can easily fail to understand. There is a Director of Spiritual Development at a Seminary that I have known quite a few years. A truly passionate and giving member of the ordinary. One day, as luck would have it, he rear ended my car. As I walked back to exchange info, he let out a torrent of abuse and obscenity that would have shamed a sailor. For a moment, my cheeks turned red in anger, but I swallowed it and simply ducked my head down so he could see me clearly and said “Father, it’s me.”
He burst into tears. He had been at the hospital with a family while the husband died of cancer and was late for still another funeral. His car got the worst of it, so we parked it and I drove him. While he was in the Mass, I made arrangements to get his car towed.
Every situation is different, but it occurs to me if your priest is frustrated to the point of explitives and harried enough that he possibly skips formalities of the misal, then perhaps he needs more help with his burdens and prayers of support than spiritual instruction.
Pax Christi