Scarring, good, bad or ugly?

I went to a late afternoon wedding last night. There was a young (30ish) y/o woman there. She had several tattoos but also had many, maybe 75 or so scars on each arm from the shoulder to her wrist. These were on the tops both arms and were evenly spaced each about 1 or 1 1/2 inchs long. Some were very old and faded, others had just healed and still looked tender.

Now: My wife said she was a nutbag, period. I didn’t disagree, but said that some people consider scarring with a razor, a form of body modification and it is perfectly acceptable in some circles.

My wife thought I was totally wrong and may also be a nutcase. What is it?