Kabuki has been developed as popular entertainment, therefore, the audience doesn't need to get tensed up as long as they have good manners using common sense.
歌舞伎はその歴史的経緯から庶民的娯楽の側面が強く、常識の範疇でマナーを守れば本来、あまり緊張し肩肘はって観劇する必要はない。