Sure, its hypothetical because allowing this business to conduct in this manner is a slippery slope to allowing business to be very specific as to who they serve.  CLEARLY, this baker asked for specifics when making this cake.  Why could no other business selling goods not do the same in the future if the Supreme Court rules in this guys favor?

You call it hypothetical nonsesnse because you dont want to deal with the real issues that could stem from allowing this guy to discriminate against serving someone based on religious reasons.