My mare can have more difficult moments than backing up and my farrier is fab with her thankfully. I dont think your farrier was rough in any way. Im not saying that at all and hard to comment when cant see it all happening just reading about it.
Getting the right farrier if your horse has issues is vital which I learned the hard way. However, to improve the situation I spent ages every day getting her used to lifting her feet for longer periods of time being held as it was the pressure of being held she freaked out at or longer time held up to be worked on.
If you know the trigger then work on this slowly step by step never pushing beyond the comfort zone making it then a bad experience and horses never forget a bad experience unfortunately.
Getting the right farrier if your horse has issues is vital which I learned the hard way. However, to improve the situation I spent ages every day getting her used to lifting her feet for longer periods of time being held as it was the pressure of being held she freaked out at or longer time held up to be worked on.
If you know the trigger then work on this slowly step by step never pushing beyond the comfort zone making it then a bad experience and horses never forget a bad experience unfortunately.