Earlier quoted context omitted.
So his issue was not that you discovered the bug. His issue was that after discovering it, you went on to view a bunch of other people's data. What you did was walk down the block, pull on the doors of random houses, and if you found one unlocked, went in and took a look around. If you found my door unlocked and left me a note, I would be grateful. If you went in and took a look around, then did it to all of my neigh…
I think that's a PRETTY uncharitable analogy and interpretation of the OP's actions. I would say it's more like: You are walking down the street, and notice that there is a public noticeboard. It has a list of names, yours among them, associated with a number of steps each. It instructs you to walk a certain number of steps down the street, and then look up at the paper taped to the sidewalk that many steps down. So,…
Or perhaps, "Here's a binder with numbered pages; turn to page 345 for your information." You wonder what's on page 346, so you turn the page, and lo and behold, someone else's information.