Serg, it goes way beyond that.
Modding a guitar is an antisocial act that undermines societal norms and is a first step toward the collapse of civilization.
Research has shown that the collapse of the Roman Empire was caused at least in part by the modification of musical instruments (which the Romans referred to as cithara modificatio), and not as some believe, by such causes as a burgeoning Germanic population that was pressured to migrate in its turn by tribes like the Huns, or having its own population weakened by plagues and a malaria outbreak in the 4th Century.* The result of this cithara modificatio? nearly 1000 years of reversion to subsistence farming, dependence on primitive beliefs instead of a strong central authority, and chaos.
It is also unsettling to note that in chaotic periods of history the masses do not dress well. I would suggest going into any Wal-Mart or shopping mall today and comparing how people dress with photographs of similar places merely 50 years ago to see with your own eyes how our society is falling into disorder.
The mere fact that we, a presumably civilized society, tolerate our own cithara modificatio is clear evidence that the world is going to Hell in a hand basket, and we should have none of it. The first step in restoring a truly civilized society to glory is to refuse this practice.
Don't even get me started on the deleterious effects of tolerating Rock and Roll or Jazz. Or the wearing of blue jeans, T-shirts, and (especially) sweat pants in public!
A musician should wear a suit, tie, play only classical music on a stock instrument, and show a little respect!
*Effects of Cithara Modificatio and the Collapse of Roman Civilization, LSchefman, University of Northwestern Detroit Press (1993).