We've had some people here getting mad when Sayu followed up on her "chubby" jokes before, this show looks to be continuing in the same vein times x100 so yeah... there'll be some people getting mad.
Not sure what they want though really

Kanon has been bringing up that topic consistently in recent times, she's trying to stand out with it. If anything this is proof that it's working and she's getting positive results so good for her. Imagine if no one responded to her bringing it up or just matter-of-factly acknowledged it and continue on as usual, that's just gonna be awkward as hell.
To be honest I'm in Sayu's camp that I prefer idols not to be the butt end of physical jokes but hey they've got to start somewhere (I still remember Sayu's sumo makeup xD ) and I''d rather take the chubby angle anytime than bug impressions or fruits or frikkin toilets *shudders*. At least it feels like she's going somewhere with this ... promoting positive body image etc etc