I once pushed someone aside when he wanted to play one of my records without brushint off the dust first. No one touches my records without my permission (you only need that once though, I just want to be sure you know how to treat them) and no one uses my records in a way I don't agree with.
Pretty much the same with your guitar, only I wouldn't have acted like it was no big deal.
Musical instruments are probably even more valuable to the world of music than records
