Hate husbands friend

There’s one friend that my husband has who I cannot STAND. Just the thought of him ticks me off, albeit he lives halfway across the world. I have caught on numerous occasions him sending porn to my husband though Facebook (which my husband never recriprocated), encouraging my husband to start smoking again, and just all round a douche. I hate him so much but i don’t want to say anythjng to my husband because he will say that’s his friend and I don’t need to worry. Anyone else dealing with a shitty friend of their partner?