How is Christian Horner (Red Bull Racing F1 team principal) a troll of a human being? He’s one of my favorites in F1. He’s blunt and strictly business, but a troll...?
This article[1] describes him as "ruthless" and unnecessarily critical, and I'd assume that's most people's issue with him. It has recently resulted in him not giving young drivers much of a chance to "find their footing" before demoting them (e.g. Kvyat, Gasly, Albon).