They ought to be free to only supply a product which contains an expression of approval or blessing or celebration to whomever their consciences deem they may supply said product without committing sin. And if that is stricter than the Lord intended, still the Lord would not want their conscience gratuitously violated, that is without genuinely being persuaded.
No, it is not stronger than the Lord intended. Romans 1:32 states that those who approve of homosexuality and sexual immorality are as bad in the eyes of the Lord as those who practice them.