MEGARMS
KnowNothing
If it were an engraved gun or collectible, I would call it an idiot scratch and I would be upset about it too. For a working gun, IMHO, it is meant to be used, wear and scratches don't mean that much. Those things are bound to happen eventually if any tool sees much use. You can easily tell which of my guns see a lot of use and which are collectable works of art.
That is ok. You just happen to fall into the "I do not give a shit" crowd. Those in that crowd just need to understand that there are a lot of folks in the "I do give a shit" crowd and stop telling them that they shouldn't worry about it.