Why do wizards hate sorcerers?

[Winter]

While the wizard might be able to solve the magical riddle preventing your party from venturing deeper into the ancient ruin, a sorcerer can stand before it just as clueless as the fighter if it's not just happen that one of his known spells can be used to blast through.

That cannot be it for the general case: Sorcerers also have spellcraft and knowledge(arcana) as class skill.

It should also be pointed out that this "rivalry" is something we are seeing in Rich's interpretation of the rules. The rules as written do not mention this.

I think the rivalry makes sense due to all(!) the stuff outlined above. There's a lot reasons for "academic" wizards to look down upon those arcane Rainmans (who in turn have the right to feel looked down upon).
I always saw Rich's interpretation of Wizards as elitist university professors.