According to his mother on Facebook:
After our walk around Washburn campus, we ran into the Phelps... Josef was determined to make his own statement so we went to the car and with pencil and his sketch pad, he made up his own little sign that reads "GOD HATES NO ONE". I have never been prouder. Those people are scary but he stood strong, was respectful and stood by his convictions. He will be a good man, I have no doubt. I got my Mothers Day present early.