username, If I know I don’t eat lesheim Shamayim and I am a big megusham when it comes to food, would I be justified not to eat in the sukkah because I feel guilty eating there?
If you really feel guilty, and you know that eating not Lesheim Shamayim in a Sukkah is really bad, I could see a Sevara to say that.
Would I mechadesh such a minhag on my own? No. Not at all.
But then, if not for the existing Minhag, I (and most likely the Rebbe) would say to sleep in a Sukkah also.