People think the stem is too tough, but it just needs to be cooked right. The trick is to start cooking the stem pieces first, then when they just start to be cooked, add the florets. Exact timing depends on the cooking method, but if done right all of it will be tender and tasty.
Dude went dumpster diving for a name. It’s not theft if they’re throwing it away. One woman’s trash is another man’s treasure.