In-N-Out is one of the most polarizing fast food restaurants in the Southwest. In California, there exists a cult like following that swears by the chain and will defend it furiously. Patrons who hail from other parts of the country often find it over-hyped and claim example-B from hometown-Y serves up fare 2x as delectable and is more deserving of praise. Others hate it simply because they enjoy being contrarian dickwads and are required, by their official Dickwad by-laws, to hate things others like.
Every region has their darling. Texas and her neighbors have Whataburger. The Midwest seems split by the Mighty Mississippi; the eastern portion preferring White Castle and Steak 'N Shake while the west of the river the taste leans toward Culvers.