"If you were to say a trans man is not a real man or trans woman is not a real woman, you would not be prosecuted under the bill that I am intending to bring forward, so long as you didn’t do it in a threatening or abusive way that is intended or likely stir up hatred."

'Likely to stir up hatred' is subjective and a low line to 'prove' so they have a strong get out of jail free (or, rather, go to jail) clause there.

On the plus side at least the police federation of Scotland are against this bill. Here in England a woman just tried to join the police force but was rejected because they considered it hateful that she said on social media that it is impossible to change biological sex. When she said she knew a couple of police officers who also had this view the recruiter said she should hand over their names so that they could be 'investigated.' It's getting more like 1984 every damn day.