Anandi might have had a few classes on the topic of widow remarriage or treating widows better -- so when asha showed up -- the oldies were all sort of mentally prepared for something like this.
In general, since they already walked out once and came back (during dhongibaba case) -- they probably dont want to repeat these walkouts again and again. They know anandi by now and have accepted her radical social reforms - past and forthcoming - without batting an eyelid.
The oldies in the class are quite fond of anandi too.
The ladies who were gossiping about shravan are not her students. They are others who have not chosen to attend her class so their small town mentality remains the same.