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Jenelle Evans is firing back after her teenage son Jace dropped text messages online -- accusing her of mistreatment and even dredging up past abuse allegations against her ex-husband, David Eason .

On Tuesday, Jace shared screenshots of private text messages between him and his mom on his Instagram. In one of the exchanges, Jenelle fired off, "Your the one saying you're going to have my custody taken. F** YOU,"* after Jace told her he didn't need her in his life. Instagram / @jace_vahn

In another, she accused him of lying about David strangling him -- to which Jace replied, "I never lied ... he tried to ..."

Now, Jenelle is responding to the leaked texts and allegations tell TMZ ... the texts were taken out of context and posted in retaliation after she discip

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