Being a 'heretic' has its cost, usually only compensated by people coming up to you years later to quietly mumble apologies because you were right. Sometimes, they were among your most vocal critics.
Just make sure your ducks are in a solid, scientific row, and stick to your guns, with the thought that if you are ever proven wrong, not just shouted down, but through good science scrupulously performed, that you can let go of a position truly disproven.