Arsenal fans I know irl and online (though online are far worse) all have this weird insecurity. It's like they know they've hit an unexpectedly good streak and know it can't last and are desperate to win one of the big ones before it inevitably fades away.
But it's mixed with this weird arrogance and moral high ground that's based on nothing at all. Listening to them you'd think the arsenal side of past 2.5 years is one of the greatest football teams ever.