Not professionals, no, but the harsh judging and Craigs criticism make it clear that they expect them to learn to a professional standard.
That puts pressure on the Pro's that are teaching the celebs the choreography.
You also have to bear in mind the environment those pro dancers were taught and train in. it IS abusive, they DO get yelled/sworn at and picked up over every aspect of their appearance and form, some of that will bleed over when they teach the celebs.
You notice that pro's who've learned other forms of dance haven't complained, because they were also taught that way, especially anyone who used to dance ballet, they're the worst of the lot >.<
I'm a singer, opera trained, and i've done musical theatre, and i've had my fair share of being shouted at for getting stuff wrong, it really is a case of if you can't stand the heat, get out of the kitchen.
Should it be like that? No, but it can be, and has, and that's what's caused this, not because the pro's are horrible abusive people,, but because that is how they were taught, so is how they teach.
Does it need to change? yes, which is why the BBC have apologised and Gio doesn't have a job there any more, and why they have put stuff in place to chaperone.
None of this takes away the fact that the way AA went about this made a mountain out of a molehill and ruined her career and damaged GP's.