In my profession — medical emergency trauma — I treat all sorts of folks,  male and female,  gay and straight, law-abiding citizens and convicted criminals,  all religions and all races... and yes, even some KKK members.  If I were not willing to treat each person competently, compassionately and without discrimination,  then I would need to find another line of work.  My job description does not include being the morality police.   Treating people fairly does not de facto mean that I agree with, endorse or enable,  whatever they do in their private lives.  That's not my business,  nor should it be.

A baker bakes a cake as a capitalistic endeavor...  to make money. In a pluralistic, non-theocratic democracy we don't get to crouch defensively in our religious ghetto denying to others the same freedoms we claim for ourselves.  Given the tragedy & danger of our world, this cake controversy is, in my view, silly. The baker needs to get over himself/herself.