From https://therollingexplorer.com/everything-you-need-to-know-about-disability-pride-month-in-2020/:

Disability Pride is a fairly new and radical idea. As we learned above, the ADA wasn’t enacted until 1990.

Let me put this into perspective. If you are currently 31 years of age or older, you lived in a world where people with disabilities were unprotected against discrimination in education, transportation, the workplace, and other areas vital to a good quality of life.

Additionally, many people without disabilities still view disabled individuals as lesser humans. Because many people with disabilities are unable to work in the same capacity as their able-bodied counterparts, they are deemed weak and unproductive. In our capitalistic society, this obviously doesn’t bode well.

These hostilities and viewpoints are incredibly damaging to the self-esteem and mental health of people with disabilities.

Disability Pride is all about reminding ourselves and the rest of the world that we MATTER and have VALUE just the way we are.