To accept it, you just move on with your life. Find the next thing you should do and do it. The more you dwell, the harder it will be to stop dwelling, so just break the cycle and go do anything else.
You will encounter plenty more people who are insistently wrong. Each one will affect you less than the last.
Google also is responsible for the SEO industry. They made ads hugely profitable, then started directing traffic to sites that serve more of their ads, regardless of quality.