On our last flight, LAX/SEA, choice of snack box offered. Later, FA came out with snack basket and offered it to the non-revs only. As I was on aisle, had my hand out to make selection but FA keep on walking. Somewhat perplexed, thought Perhaps she was working back to front. after It was offered behind me, made eye contact, she ignored me and offered it row in front of me. Took the hint and let it go. Easy to tell who the non revs were - by conversations and late seating to fill up F.