If trying out the slow version doesn't wprk out for you, there's always the option of disabling sound in your settings. Assuming that this is still a problem, that is.
It is only heteronormative if the course exclusively offers heteronormative sentences. An inclusive course offers all kinds of inclusive sentences.
This course in particular also offers sentences such as "he loves him", "she loves her", "he cooks for his boyfriend", "her wife is a priest", and many more. It is possibly the least heteronormative course on Duolingo.
Please do not make assumptions based on a single sentence.