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To show it wasn't just the lax standards of the 15th century that allowed king and courtiers to talk through someone's song, here is an equivalent complaint from 1210:

..there are those without any consideration who will speak to you [the minstrel] aside and ask you to sing in front of everyone else; and they will not observe good manners nor time nor occasion, and at the third word of the song, whatever you are singing, they will grumble and begin to mutter to someone else, or begin to tell a story...

(from Abril issia, written by Raimon Vidal, translation from C. Page "The owl and the nightingale").