How to convince my friend she's being stupid?

My friend was saying how she wanted to get Minecraft. I explained to her that it is about $40 at our local game store. She said "Oh that doesn't matter. We can get it free on the computer. My brother found a free download online, so obviously we're doing that instead of having to buy it." I am... show more My friend was saying how she wanted to get Minecraft. I explained to her that it is about $40 at our local game store. She said "Oh that doesn't matter. We can get it free on the computer. My brother found a free download online, so obviously we're doing that instead of having to buy it." I am like WTF. How stupid!!! Her brother is the most unintelligent 10 year old I've ever met and she is only 14.... They have no idea what a torrent is, let alone a seeder, or let alone what a meme even is. How can I explain to her how STUPID she is?! She doesn't even have a firewall or any antivirus. What can I say to her?
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