As someone who solos a lot... and I mean A LOT... yeah, I can understand their feelings. Not that that's how I act or condone what they did, but I understand. On one hand, this FF game looks, feels, plays like no other. (thus far). On the other hand, you need to play online. If you run into players like this again, try to go down this conversational path.
"Remember that magic draw system in FFVIII? Yeah, boy did that suck balls. But we needed to deal with it to play FFVIII, right? Yeah, this game can suck with all partying, but you need to deal with it to play this game. Just about every FF game has it. The skill map in FFX, the 'no levels' thing in FF2(jp). So, just roll with it."