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Jenelle Evans is putting MTV on notice about the way she says it's portraying her and her fam on this season of "Teen Mom 2" ... saying she'll leave if they don't make it right.

We got Jenelle at LAX about a week after a huge blowup she and husband, David Eason, had on a season 8 episode. Fans blasted David for verbally abusing Jenelle, and also called her a neglectful mom.

Jenelle told us she's the victim of creative editing, done purely to create more drama, and she's pissed about it. She's also angry that producers are putting subtitles on her kid because it makes it seem like he has speech issues.