There's alot of factors to why Blades fans are negative... just off top of my head;
. 14 point gap closed to 4
. No signings in January (Was needed)
. Dodgy "rich men" wanting to buy the club
. Current owner skint
. Debts/installments not being paid
. Transfer embargo out of nowhere
. Injuries every week
. Performances not been matching results
This isn't me bedwetting, I'm just giving a few examples as to why some fans may seem negative when things were going well.
Never lasts the good times being a Blade