Well, trauma may be too strong a word although I know some men who were truly traumatized when their beloved car got scratches.
So, the other day some friends came over for dinner and after a while my gypsy jazz guitar (in mint condition) made its appearance. One musician friend was very impressed with the quality of the Castelluccia guitar and played a few blues tunes and rock songs. We had a fun night and I didn't pay much attention. The next day I took out the guitar getting ready to practice. And I noticed lots of scratches either from friend's nails or pick on the top where many people install pick guards.
I know these scratches don't hurt the sound of the guitar and they are really cosmetic. I kind of know this would happen one day but I never create any scratch. When I play la pompe none of my fingers or the pick would be in contact with the surface. But he wasn't playing gypsy jazz and made a lot of contact. Naturally my heart ached for my guitar. Silly, I know.
How did you deal with this negative emotion when others scratched your guitar? Grrrrrr.