Why not? Do you have to share the views of every single person within a group to be considered a supporter? What if they vote for every pro-LGBT politician that runs for office? What if they vote for every pro-LGBT legislation that they come across? What if they give support and words of affirmation to LGBT family members that are close to them? Why is he suddenly not a supporter because he disagrees with a small part of the discussion? This seems like throwing the baby out with the bathwater.