I'm not going to get upset with myself anymore when it angers me because the priest or a congregant takes liberties. If the Mass hasn't been messed with, distractions caused by improvisation or other misbehavior would be few and far in between.
You can have the most orthodox priest possible celebrate the Novus Ordo and someone will still attempt to sabotage the solemnity of the Mass. Because they simply can.
I know I sound like a broken record. I don't care.
I saw something on an FSSP site recently that succinctly explained why reverence at Mass is a must. To paraphrase, the author reminded us that Christ gave us the Eucharist in order to be close to us, but His desire to have us draw near does not remove the need for the utmost respect.