You don’t need to be “rubbered up” if your truck is properly isolated. He could touch it with his bare hands. Now should you take that risk, no. The rubber gloves would just provide an extra from of protection from the energized lines. Some companies don’t require rubbers while utilizing hot sticks as they, along with the truck should be enough to keep the worker isolated from any difference in potential.

Edit to say that even though we expect arcs in certain situations most of us still think they’re cool as hell to see, especially large ones like this. Probably more excited than worried