Western society is built upon free speech.  It is a fundamental democratic principle.  Many of the  people who were alarmed at the Conservative government's proroguing of parliament, use of omnibus bills and limiting house debate are concerned that legally compelling people to use certain pronouns is another small nudge away from freedom and towards authoritarianism.  This isn't right verses left,  it is a sincere and legitimate concern. 

If I had a trans friend that wanted me to refer to them as "they" I would in civility and respect make every effort to do so.  I don't know that I would be able to remember a non-standard  pronoun.  It doesn't seem reasonable to have the law so open ended that there is even a chance of prosecution for making a mistake.  Laws need to be tightly defined, because some are adept at leveraging it for their own aims.

If it weren't for free speech LGBTQ rights wouldn't be where they are today.  To ensure enduring freedom, we must protect free speech.