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Hello everyone!
No creature types (or sub-types) are specifically immune to confusion, but many, of course, are immune to mind-affecting effects. Spells that cause confusion are typically mind-affecting compulsions, so constructs, for example, are immune to those spells.
However, using a Cleric's variant channeling of the "madness" variety, one can cause targeted creatures to become confused. This is not stated to be a mind-affecting ability and is not stated to emulate any particular spell. Further, the "confused" condition itself is nowhere specifically stated to be mind-affecting (no condition is, actually).
So, if a construct fails its will save against your negative energy channel, and you have the madness variant channel ability, is the construct confused?
It's worth noting that there are also variant channeling abilities that cause the nauseous and dazed conditions, so similar questions could be raised in those cases as well.