If Ramadhan is the only time someone goes to the masjid, wears hijab, prays, stops smoking and drinking, reads Quran etc then good for them.
Dont talk about them, dont call them fake muslims, dont call them that awful name "
Ramadhan Muslims" to
describe them because for all you know during that one month of the year they maybe 10 times more sincere
and pious than you are all year round.Remember that arrogance was the reason for Iblees expulsion from Paradise!