Presumably he would also refuse to wear a shirt promoting Wonga, Budweiser or Walls Sausages too as he views all those things to be immoral. I would assume he treats people who earn interest on their saving and drink with due respect, and would hope he treats gay people with the same respect. He doesn’t have to actively endorse them though.
I think adulterers are immoral. Presumably many people who cheat aren’t of the same view. I still think they deserve respect and treating like a human being and equal rights, but I won’t be decking myself out in Ashley Madison merchandise.
We should be judging individuals by their day to day actions, not whether they take part in performative acts which actually mean very little.