It's hard to think Lani is "taking advantage" of Xander when she still likely has to be his mother much of the time for daily living, even if it's through shortcuts like getting Taco Bell or him.
Does she not know to cook or is Xander just a picky eater and requires fast food or microwave dinners?
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Going back to the picture America's Hat posted though -
1. Fast food plus Starbucks cup so either multiple meals of fast food or he's really too lazy to clean up.
2. It's a meme that zoomers should cut out starbucks or a top end smart phone to pay rent, but if Xander is complaining about a $217.28 paypal balance, he can at least double that by cooking instead of going out for fast food and then he can afford a gun + trigger lock for self defense.