I'm going to chime in and agree with others about going to the principal. I recommend sending him/her an e-mail about the incident. Always, always, communicate in writing. Written communications are less likely to be misinterpreted --- or ignored.
You can be honest yet polite: your child's teacher doesn't seem to take his learning style into consideration and she also told him that she's "given up" on him. You find this remark disturbing, and are concerned...etc. Request a meeting with the principal.
This all sounds so awful. I'm so sorry.
Val
