Ok, so I just got home and finally had a chance to test disease cloud with my brother. His Burst of flame spell, a level 1 druid spell that does 5 dmg, was able to pull aggro off of my SK after I casted Disease Cloud. Maybe the Disease counter hate was removed? I don't know if this is intentional or not. Not sure at what time the disease counter hate was removed. Based off of these links:
https://everquest.allakhazam.com/his...es-2002-1.html &
http://www.tski.co.jp/baldio/patch/20020424.html, the counters were removed April 23, 2002 to decrease the hate on slow spells that had a disease counter added to them.
I can't seem to find exactly how much hate a disease counter should add though. I'm not sure if anyone had posted this in era.