Woman tries to buy birthday cake for her wife...

[Goldwater]

It's been illegal for over fifty years for private businesses to discriminate based on race, color, religion or national origin.  There is no logical argument in today's society why this shouldn't be amended to include sexual orientation and gender identity, unless the argument is in favor of abolishing this law entirely (which would obviously be a return to a dark and scary time in our history, but at least the argument would be logically consistent).

Basically, this.

[Goldwater]

I still think the best answer is no.  Wouldn't you want to know the person making your cake was prejudiced against you?  Why force them into making something and have them possibly sabotage that item because they don't like you? Shouldn't others know about their prejudice and get called out on it? 
Wouldn't you want to give your money to someone who appreciates your business?

TBH, I think this a good argument for repealing anti-discrimination laws in general, which I would support. But as long as we have them, they need to applied consistently and fairly.