The lying.
Remember how supporters of the Core used to tell us all the time that these standards were written by teachers? All. The. Time. Do you know why they’ve stopped saying that? Because it’s not true, and at this point, most everybody knows it’s not true. The “significant” teacher input, the basis in solid research — all false. When someone is trying to sell you medicine and they tell you that it was developed by top doctors and researchers and you find out it wasn’t and they have to switch to, “Well, it was developed by some guys who are really interested in mediciney stuff who once were in a doctor’s office” — it just reduces your faith in the product.