Heres a few thought/retorts:
1) I didn't pay my money to you so that I could be insulted and picked on, if thats what I wanted then I'd go to a comedy club!!!
2) My vet recommended you, what would you suggest that I say about how I and my pet were treated in your class tonight?
3)Have you ever worked with toy breeds? I worry about their more delicate necks.(using the gentle leader)
4) Remember "Legally Blonde"?...yeh,everyone thought she was just fluff too!
I'm so sorry that you're going through this...I kind of wondered when you said that this trainer worked a lot with larger breeds
In our family we have tinys up to giants (80# +) and I see no difference in how they should be treated- all are special!
If you do decide to stay in this class, ignore the morons and let your lil one show 'em how its done!