Hey Pookie,
Sorry I am a little bit late to the party but yes, Bikram Yoga teachers can be quite strict. Having practised in different studios though, I found that some studios have a different culture than the other. If it’s possible, you may want to talk to the teachers about it (so they understand your confusion and will help guide you more gently), or try a different studio?
Also, came across this article that outlines the benefits and politics behind Bikram Yoga, thought you may enjoy checking it out.
Peace,
Shan