It's rude to make fun of someone's weight.
Alexis is hosting a cookout when she notices her friend Chrissy eating something that breaks the rules of the diet she's been on.
Alexis wants to talk to Chrissy about her diet.
Alexis asks Chrissy if she can make her something that would adhere to her diet.
Alexis tells Chrissy that she wouldn't be so fat if she was able to stick to a diet.
Chrissy tells Alexis that that won't be necessary because she is allowing herself one day off track.
Chrissy starts to tear up and leaves the cookout.