Washington Football Team head coach Ron Rivera is absolutely sick and tired of the fake news about the COVID vaccines ... calling misinformation spreaders "f***ing a**holes" who are causing people to die.
The 59-year-old -- who is immune deficient after battling skin cancer last year -- has been a strong advocate for getting his team and others to take the COVID-19 vaccine this season ... saying back in July he was "beyond frustrated" with players who hadn't been vaccinated.
Rivera says one of the biggest hurdles he's had to get over is all the wild lies that "experts" have been sharing on the internet .