"Do you have any Israeli stamps in your passport?

a) I suspect your experiences would have been different if you did.
b) Would it bother you to know that you wouldn't be allowed in certain countries simply because you had visited Israel?
c) Did anyone in those countries know you were Jewish? Would you have been comfortable telling them?"

I suspect the answer to (a) is yes. I am not Jewish so I cannot answer (b) and (c). However, the reason for yes to (a) would be political rather than religious or racist - unless the writer did experience racism or discrimination on account of their religion. For many people opposition to Israel is not the same as opposition to Jews or anti-semitism.

Those with Cuban stamps on their passports may be given a hard time entering the US. In the past a TRNC stamp would have caused difficulties entering the Republic of Cyprus or Greece.

Pakistanis have to clear many hoops and hurdles to enter India, and then have to register at police stations on arrivals. This does not mean that India is opposed to Muslims.