I certainly can relate discussion in here to discussion out there, because all this discussion is a matter of the way we talk to each other, the pace of the conversation. This type of thing can happen ANYWHERE as long as you led the discussion right. As said, I've had this happen on 4chan.
Gamer98 is the type who only stopped in once to say his piece and leave, not everyone is like that. If someone cares enough to reply more than once, I guarantee that I can convince them.
Gamer98 is not representative of the entire dismissive populace.
When someone like that comes up, you ask them to elaborate on why they think the way they do. If they do not reply, it is not worth bothering with. If they do reply, then it is possible to persuade them.