I think it's a pitty if that is the attitude that was coming across during the training and even more so if the instructor was going along the same lines.
The only thing I would hope it that part of the attitude that was coming across on that occasion was more based on humour and tounge in cheek views, than what pilots/trainees really think. I know as cabin crew, and especially when away from pilots, we have all sorts of views and jokes about pilots personalities, abilities and various things but would not intend for these to be expressed towards flight crew generally and certainly come across not while at work or during training.
For that reason, I think it's the attitude of the trainer during training that is most worrying. Yes outside of work we can have all sorts of jokes and opinions about each other and I personally think that's fine. But once at work or inside the classroom, it's essential to revert to serious mode and ensuring the right CRM, teamwork, respect for each other's role attitude is encouraged. (even more importantly so when working with brand new pilots who have not flown with cabin crew before and so are just beginning to form attitudes)
It makes me think of the CRM excersise where you get a flip chart and make pilots brain storm "cabin crew" - depending on how to generate discussion, either the degrading rude memarks could be incouraged - in order to then work through and dispell them or to only encourage productive comments to highlight the importance, strengths and benifits of cabin crew. If doing a joint course, get the cabin crew to do the same for "pilots". Depending on team spirit, it can then be very enlightening to show each group, the other's comments.