Aggressive use of hair clippers on transplanted hair. Any suggestions? (photos)

Having a drunk guy cut your hair is never a good idea.  Cutting your hair after 2.5 months will not impact your surgery.

Grafts are extremely susceptible to damage in the first two weeks post op. After that the chance that anything you do will cause significant harm is significantly reduced. At 3 months, there is very little that can go wrong except if there was bleeding and persistent redness, swelling and pain beyond 5 days.It's always a good idea to check with your surgeon and have him or her take a closer look - but it is extremely unlikely such an event would cause harm. 

You are so far out from the procedure that it is not likely to be related to the clippers.  The  overall and final healing can take 1.5 years so I would be patient but also go in for follow up/exam directly with the doctor.

The damage depends on how deep and how hard the barber pushed the clippers into your scalp. If deep enough to go into your scalp for more than one centimeter then you may have damaged them but if less then the chances are it didn't reach the follicles and they are ok.  

With your observations, I would go back to your doctor and have him check you out. Clippers which have been used over and over again on a drunken barber, could move anything from another patient to your head if he pierced your skin. Risks include Hepatitis.