2 weeks post FUE. I rubbed my dry hair to remove the scabs that fell with the hair. Have I damaged my follicles?

If you followed your post operative instructions on how to wash your hair it should be fine. There is no way to assess if you damaged your grafts on the Internet.  Most likely it should be fine, but there is no way to tell.

Thank you for your question. It is important that you are gentle in the touching and cleaning of your scalp within the first two weeks after the procedure. You should also be aware of sun and wind exposure as well as too harshly taking on and off clothes around your scalp. Please review recovery instructions with your board certified facial plastic surgeon. We recommend our patients use baby shampoo and massage their head gently in the shower. 

Best wishes,

At 14 days the scabs should be off, and your grafts are pretty firmly anchored into the skin now. Gently rubbing off the scabs shouldn't cause any issues, and if had damaged the grafts there would likely be blood or some kind of evidence of trauma. Can't say with 100% certainty they're fine over the internet, but it sounds perfectly normal.

At two weeks following your procedure, the grafts are permanently in place and will not be dislodged.  Rubbing your scabs gently to allow them to come off at this point is fine and should not damage them. 

at this point in time your grafts are secure. the scabs and the hair shafts should be falling out at this point in time, which is normal.