Way back in this discussion you stated this as your rationale:
To provide a service for a gay wedding is to do something that supports sin, treats it as not a sin. That's why we don't want to do it.
Seeing as you agree that gluttony is a sin, providing cakes for someone to commit gluttony, is doing something that supports a sin.
Selling baked goods of any other sort to any kind of sinner does not do anything to support the sin
this is not true.