Which franchises did he kill off?
Terrible working relationship and ethic instigated by him between Konami - in turn cutting their allocation of funding and resources into AAA Video Game Development. Metal Gear Solid, Silent Hill & Castlevania which all had development roadmaps, now shut down and collateral because of him.
Most don't know what actually happened. So it's only natural people will blame Konami for what happened because it's easier to pin the cause of the situation on a company with no face, than to accept even people you have respect for can make mistakes.
Where did the Kojima hate come from?
If that guy makes s**t games...then who makes good ones?
Not always obviously. Everything he's touched since MGS3 has been average, he's been banking on stored credits for a long time now.