It annoys me people say IQ doesn’t exist or doesn’t matter, yet turn around and say not everyone is smart enough to succeed in school

In high school, teachers talk about how most students can’t get As no matter how hard they work. Getting As requires above average intelligence. Yet, so many people also say IQ isn’t real or rac*st or whatever nonsense. It frustrates me such an important subject just gets thrown under the rock. Innate intelligence is not real, but eye color, athletics, and height are?