Now I did not know he was a 'Jeep guy' did I? But certainly knew he was not at his best when he did your vehicle.
But regardless of his vehicle preference, as a mechanic he should know how to properly install and pre load a set of wheel bearings.
Given the poor workmanship I would have everything checked out by someone else, sorry if that sounds harsh but I am a mechanic (50+ years), with my own business, I do not specialise in any particular marque, but whatever I work on I do it properly.
Regards
Dave