Let’s start with conservatives, who developed a special loathing for teachers unions (and public employee unions, in general) because union dues fund liberal causes and candidates come election time. Conservative think tanks and philanthropists have sown seeds of skepticism about public-education-anything for decades, which means that when teachers say that their wages are low, their working conditions tough, and their cost of living untenable, the public just rolls their eyes.
Source: latimes.com – Los Angeles Times