Challenge messages of hate, rather than blocking, ignoring, or dismissing them. Learn the insidious methods of covert racism and bigotry, identify them, and bring them out of the dark and into conversation. The more you learn about their methods, the more often you’ll see them in practice.
People will have no rights if they only stand up for their own.
In addition to what disguy ovahea said, vote. Vote in every election. Vote when it's inconvenient. Vote when your boss is annoyed it makes you late for work. Go to the town hall meetings and ask questions. Demand more from your local politicians.
This writer proposes very little in the way of actual policies. And this subject has been covered many times over, by better writers. They seem to be very inwardly focused on their own Ashkenazi experience and only mention the latest bogeyman (bogeyperson?) of transgender people.
Read W. E. B. DuBois's book "The Souls of Black Folk". In the introduction he describes well meaning liberals who don't actually understand him like this:
they say, I know an excellent colored man in my town; or, I fought at Mechanicsville; or, Do not these Southern outrages make your blood boil? At these I smile, or am interested, or reduce the boiling to a simmer, as the occasion may require. To the real question, How does it feel to be a problem? I answer seldom a word.