The thing is, more than likely when someone tells you what the font is, they used an online tool to search for it. I answer a lot of people's font questions that way. It is not that sign people just know fonts better. Though some do. There are common fonts most of us can recognize, but those tend not to be the ones people ask for help with.
So learning the tools we use and how to use them effectively would serve you well. That's what people were trying to tell you, though with a touch more irritation than I am displaying. For that matter, there are forums on some of the font sites where you can ask for help as well.
It all goes along with that saying that if you give a man a fish, he can eat it today. Teach a man to fish, and he can feed himself for life.