I've certainly had my mind changed.

One of my earliest memories of the internet was when I was like 12 and I went to nuklearpower.com (home of the 8-bit Theater webcomic), and I saw a thread in the forums debating religion. I knew atheists existed, but had never met one and never really considered why I believed the things I did, or why they believed something different. I posted a comment defending what I'd been taught but then started really thinking about it. It wound up reshaping my entire belief system. I realized that if everyone just believed what we were taught, then there'd be no way for us to really know which of us is right, and even if I was right it would be through pure luck and there are countless people following the same approach to wrong conclusions. This led me towards science, and towards grounding my beliefs in reason and evidence.

That was the first time I had my mind changed, and yes I was very young but it wasn't the only time. Some years ago, I not only had my mind changed but changed a big part of my lifestyle, in a large part because talking about it with people on the internet convinced me to go vegan. I don't believe I'd met another vegan irl (unless they didn't tell me, ang what are the odds of that?) and if I did I certainly didn't debate the nitty gritty with them.

There are countless smaller examples I could point to. But in virtually all of those cases, the conversation didn't end with, "Huh, I guess you're right." It ended with me arguing my position as best as I could, but being dissatisfied with the things I was saying and thinking it over over the course of days, months, even years. Changing your perspective or worldview usually doesn't happen over the course of a single conversation, but it can cause a seed to be planted.