Headbanging Optional?

Be-el-zebub has a de-vil set aside for me!
For me!
For me!
For meeeeeee!

Question of the day: Upon hearing the riff that follows these infamous lyrics from Bohemian Rhapsody, may a listener properly exercise the option of NOT headbanging?

My opinion: Unless one has a debilitating medical condition or other similar impairment, refusing to headbang during this part of the song is a serious breach of etiquette.