Arguing in Ignorance

How can someone who is clueless about a thing continue to argue like he knows anything about it? This guy was actually very clueless about the point I was making, yet he continued to rival my points and facts with his ignorance. I wanted to give him some advice about building an online community, but he was trying to make a point where there isnt.

I'm already running my community, and it's going quite well, I can say. In the heat of the conversation, I wanted to offer him tips on how to build his own community for free, but he wouldn't let me. His mouth was rattling like a snake, and he talked too much for a man. He was countering my facts with invalid points and absurdities, which got me pissed, and I thought to myself, isn't it better to keep to myself?

Then, as I reflected on the situation, I realized that I was at fault and that I shouldn't even be talking publicly about these points—usually very valid points and credible information that are hidden and not just supplied easily to the mass. This guy was a stranger to me; we just lived in the same compound. I had come out to take some fresh air, and then he also came around, leading to our conversation. As he wouldn't agree with my points, I decided to keep quiet and admit that I was wrong.