It’s a waste of time arguing whether or not Jesus Christ would bake a cake for a homosexual “wedding”. Since He doesn’t condone sin of any kind, He would never celebrate it in any way.
But from what we know, He absolutely did eat with sinners and explained why. Some didn’t like it, and some wouldn’t like it today.
About all we can assume is that He would bake a cake for a hungry sinner, and He would take the opportunity to minister to their soul.
And if He asked why and they said it was for one of these evil celebrations, He’d say no... but knowing Jesus and how He could effortlessly riff from what was evil to what was good, He might well talk about loving one’s brother righteously.
And really, they need to learn how to love their brother. If they did, they’d stop buggering and start other things that were very, very good.