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Did Lindsay Lohan lie about her mother having an alleged cocaine problem? Dina Lohan sets the record straight for ET's Christina McLarty.

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"Absolutely lied. We were having an argument, it escalated," explains Dina of their October altercation which was recorded by her father, Michael Lohan. "She just wanted to hurt me at that moment. You know, mothers [and] daughters, we fight."

Dina tells Christina that it pained her to see that private family moment "go public and viral." As for accusations that she uses cocaine, Dina replies, "I hate cocaine. I don't do cocaine."

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After Lindsay proclaimed that she was not being truthful about her accusations against her mother about cocaine use, Dina says, "I'm so proud of her for telling the truth because it destroyed me. I mean, I cried for weeks. It just hurt me so bad and she knew how horrible that was, and she came clean and told the truth that she lied. I'm very proud of her for that, which is very difficult to have to do."

Dina adds, "There's so much more to the story than the public sees, and it takes its toll on my children and myself, and we're just trying to move forward."

Watch ET for more with our exclusive Dina Lohan interview.