Pre rinsing actually makes the dishwasher do a worse job, a big part of the dishwasher detergent is to latch on to dirt and grime so when the water sprayer comes it can more easily clean it off

If you prerinse there's a lot less surface area for the detergent to do it's job. You're supposed to clean the filter about once a month, so twice isn't too unusual.

HOWEVER that being said

Just tossed stuff in, unrinsed. Wherever it would fit and still allow the drawers to close.

That's the unforgivable part