Brittney Griner isn't going to let one bad interaction spoil things for her supporters ... 'cause TMZ Sports has obtained video showing she was super friendly with a man looking for a pic with her on Friday.
The scene played out in front of the Phoenix Mercury's team hotel in D.C. -- just six days after YouTube personality Alex Stein bothered her at Dallas-Fort Worth International Airport.
During the June 10 incident, the social media troll was seen on video pestering the WNBA star about the prisoner swap that freed her from Russian custody back in December.