Q. See question above. I see that frum people go on vacation times or dates to places and restaurants that serve both Kosher and non-kosher food. Is that permitted?
Is there any reason to worry about ma’aris ayin when doing so?
A. Mori Verabi HoRavMoishe Feinstein ZT”L (Igrois Moishe O.H 4: 82) rules that eating kosher food in a non-kosher restaurant is a problem of maaris ayin (Negative impression and example).
One may argue that there is no maaris ayin as a person might enter a non kosher restaurant for numerous reasons as, for a business meeting with a non-Jewish client, or to use the restroom. Nonetheless, these things applied in his time time also, and he still ruled to be stringent.
Rabbi A. Bartfeld as revised by, Horav Yaakov Hirschman, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit'a