Adult instructors don't teach butterfly

I started swimming with my university swim club (social team) and despite watching many videos and help from more experienced swimmers, I still can't get the hang of it. I'm always holding up my lane or having to do breast stroke instead.

I asked my local sports centre about private coaching to learn butterfly and I was assigned an adult instructor. however upon turning up I was told they don't teach butterfly - usually adults only want to learn front crawl and get comfortable with the water!

Is this a normal situation for a swimming instructor to not teach one of the major strokes??