I despise people who kill animals for sport especially in this way but at the end of the day, the dickhead broke no laws, so his sponsorship shouldn't be under scrutiny.
You can't pull sponsorship deals from everyone who does something that may offend some people, otherwise there'd be no such thing as a sponsorship deal.
But I reiterate, the bloke is a class A ***** for doing what he did and the actions will have had an effect on their business.