They rose from nothing and didn't owe anyone blind allegiance. No legendary or historic roots like some other great houses in Westeros. But they should be proud that a commoner was able to rise to royalty and the the rest of the royalty class didn't accept them and continue to spit on them!!! Sure there are some bad apples but when you are sh_tted on for your entire existence what else would you expect?   Here's to House Frey!!!