Jesus would not hate anyone. The fact, implied, is that the cake artist "hates" the customer. This is a red herring argument and misses the point completely. It wasn't the customers he "hated" or objected to, it was the behavior and being asked, not just to serve a cake, which he did freely to all customers, it was that he was being compelled to "promote" behavior whic he found morally objectionable. This is the crux of the matter. Did Jesus "hate" the adulteress who was being threatened - no! However, he did object to the behavior and found it morally objectionable. This classic case of stereotyping everyone who finds a moral objection based on conscience (like Eric Liddell at the 1924 olympics) a popular ploy to smear and besmirch everyone who does not agree with the populist agenda.
Also. I was like you once. Believe me or not. But I was once like you. I asked my mom why she had an Elton John CD and played it in the car when Elton John was a sinner, and shouldn't be rewarded for encouraging others to sin. When I was about nine years old I took that CD and shot it with my brand new pellet gun, and asked my mom if she was proud of me for helping her avoid sin. I completely understand the perspective you're approaching this all from. I lived it for the first 20 years of my life. The universe is too big and too unknowable for the kind of certainty that comes with this way of thinking. There is enough darkness without us making more.
In an ideal world, this gay couple would have found someone else to make the cake. In an ideal world, simple word-of-mouth that a given business refused to cater to non-christians would be sufficient for non-christians and christians alike to decide whether or not to be a patron or client. We do not live in such a world. Tell me, what message does this tell the world about christians? What message does it tell non believers about Christianity? What does it tell non-believers about the character of Christ? If you are saved, if you have the capital T Truth, act like it.
This artist was "targeted" by the pro-gay agenda. You are right, they could have bought a cake somewhere else, but that was not the plan. For all of your words, Jesus still condemned the behavior, but not the person. Read again the account my friend. THAT is the POINT!