Any Roc can be machmir on himself, while holding the position that a given item is kosher for everyone else. My rov ZT”L did not eat MANY items that he said were perfectly muttar. It was his personal derech, but he would never impose his personal preferences on anyone else. The only time he ever did so, was when we asked him b’feirush if he would eat in a certain restaurant, and he said no, and that it was not k’dai for a frum yid to eat there, even though the food was kosher. His reasoning had to do with something unrelated to the kashrus of the food, and we understood his rationale, and followed it.
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