Or perhaps we have people who are simply not well catechised, and see someone else making a gesture which seems to make sense, and so they mimic it.
To be arrogant and prideful would, IMHO, require that they are first well catechised as to what the Church allows and doesn’t, and why.
That fits under the category of anything taken to it’s logical extreme is illogical. You and I both know that is also a red herring, a non sequitur, and a few other qualifiers. Let’s eep it to the topic, which is acts which are generally accepted as liturgical acts (although genrally regulated to certain persons).
Interestingly, a number of people in this forum have a significant problem, for example, with hand holding during the Our Father; and have labeled it outright heresy, arrogance, pride, and any number of other terms. However, Archbishop Chaput has said publicly that it is not an abuse; it is a non-regulated gesture as opposed to a prohibited gesture; and that those who wish to hold hands should be permitted to do wo; those who wish not to should be so permitted; and neither side should force their position on the other.
I don’t take Archbishop Chaput to be an arrogant individual, but I have certainly seen a hint of contempt, a lot of anger, and a bit of arrogance in some of the posters who take much umbrage with the issue.