Popa is correct here. I cannot imagine anyone can be so stupid as to dress yeshivish, walk into a McDonalds and order a cheeseburger. Therefore, I cannot imagine anyone suspecting such person of committing any issur whatsoever in McDonalds. He is obviously there for acceptable reasons. A coffee or soft drink or use of a restroom are only two examples of many. Let this issue rest, there is no problem with mar’is ayin.
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