I agree sooo much, Snopes.
Unfortunately, people almost always fall in the same trap, they do research on internet and read things that say some (common) stamps are valuable, and, because a lot of people own these stamps, because they are very common, think they are valuable.
Experienced philatelists find that frustrating, but this is not a reason to be rude in their way to talk to newbies, this just makes things worse. They need to repeat each time the same thing, but if it's told carefully and with dedication, people will generally completely understand.
When I was a newbie myself and asked questions here, people were sometimes really rude with me. I was learning quickly, and I was understanding easily since they were giving me advice, but this wasn't a good way to learn, because it could have been made with more attention and kindness.
This is why, when I explain something to someone who has less experience than me in a subject, my favourite smiley is:
We do not do something to someone that we wouldn't want for ourselves to be done.