Twitter isn't completely representative I know, but they must have some of the stupidest fans going. Thick as sh1t up there.
In my experience of football fan Twitter (and to massively stereotype for a minute), most clubs fans tend to boil down to one of the following;
Delusional (e.g. Arsenal, Massive)
Bitter (e.g. Palace, any of the big 6 clubs we've just taken points off)
General twats (e.g. Chelsea, Burnley, West Ham)
Some manage to avoid being in any of them (Southampton, for example, seem OK). Leeds however seem to manage to occupy all three simultaneously. Which is some going.