The Worst Thing You Can Call An Israeli
There is one thing we Israelis dread above all:
Being a ‘fraier’ – a ‘sucker’
That’s why we have to stand firm, drive a hard bargain, suspect anyone who offers super cheap prices, and never take things for granted.
Sauce: https://www.haaretz.com/israel-news/worst-hebrew-insult-streetwise-podcast-1.5356348
Anyone who is a fraier is the “mark” or the victim or the “sucker” or fool that fell for the smecher‘s tricks. The smecher uses his/her cunning and craftiness to profit at the expense of the fraier.