Each person only has so much money to invest in charitable causes and there are plenty of options.
If World Vision had announced that in the spirit of grace they were employing known racists, former child molesters, or members of Westboro Baptist, I’d say “thanks, but no thanks.” There’s plenty of other organizations to partner with.
So if (a) you don’t think that a settled homosexual lifestyle is a secondary issue like baptism or the gifts of the Spirit or such, but rather (b) think it’s consistently presented in Scripture as one of the many sins for which Christ died and which are antithetical to the life of the Spirit, then you’re going to have reservations about partnering with an organization that wraps Christianity in a modern American social ethic, which will (and it will) be offensive to the majority of people they are trying to help in the Majority World.
Supporting World Vision is an individual decision that can be defended well from either side. But progressive Christian friends: a decision to not support World Vision can be something else than culture-war-styled fundamentalism making a point on the backs of orphaned children.