Usually people that have been in a group since the start have this exclusive mentality. I find it to be worse with FC's that use 3rd party voice chat. Unless of course you join them in it.

Someone above said shop around for an FC. As tedious as this may seem, it's probably one of the only real options at this point next to making your own. I would post inquiring about groups that look interesting to you on reddit ffxiv recruitment, or here and ask a few questions before you join. most of the time, you can tell a lot from the responses of the member that replies.