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The biological mother of Team USA gymnast Simone Biles says she's clean, sober and has a loving relationship with her daughter ... and is sick of being painted as an addict.

Simone's story is pretty well-known ... she was put in foster care when she was 2 because her mother struggled with substance abuse. Simone was eventually adopted by her grandparents.

TMZ Sports spoke with Shanon Biles who says she's been sober since 2007 -- and is proud of the fact she reestablished her relationship with Simone.

Shanon says she does have a beef with her father -- saying he was insensitive about the way he described her battle with addiction during an interview with NBC.

"He could have been more classy about it."

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As for Simone, Shanon says she's incredibly proud of her daughter and has supported her for years -- in fact, she showed us a pic of the two of them with Gabby Douglas back in 2014.