I skipped around in it but I didn't catch the boos. Maybe it was a "Yuuuuu" chant?Around 7:00 some guy randomly leads the crowd into Happy Birthday to Shenmue in French. Unreal moment.
Someone French told me that they were booing him because he said he would like to make a game about animals. Hahaha, Yuuuuu chant! Yeah, the singing was pretty wild.