JFK to MEX in J was interesting. Food was perfectly acceptable but service was definitely lacking. Asked for a pen to complete immigration form and was told no twice. Fish entree was fine but FA was disappointed that I didn't already know the options before I was asked. Apparently I should have used the infotainment screen even though that only showed one chicken option. They also came around with a snack basket before landing but offered no beverage. Ironically the New York staff on the jetway were unmasked while demanding masking before boarding.