Of course not. But if someone finds he “can’t” keep Shabbos anymore he is by defenition not frum. But if he “can’t” eat cholov yisroel that is not the case. The same would be about the Yeshiva guy who “can’t” wear a hat and jacket or the Satmar guy who starts eating OU.
I was told of someone who was looking desperatly erev Yom Kippur for a chicken for kapporres and wouldn’t hear the tzad to use money, but was saying he doesn’t plan on fasting because “Hashem loves me and for sure doesn’t care if I fast or not”
When we start mixing up minhagim with chiyuvei krissus it gets a bit mishkebabal and we lose focus on what’s a frum Jew and what is not.