beneath somebody's dignity
beneath (one's) dignity
Said of an action that one deems inappropriate and thus would not do. Screaming at someone in public is beneath my dignity, but it sounds like not everyone feels the same way.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
beˌneath somebody’s ˈdignity(often ironic) seeming so unimportant or unpleasant that somebody thinks they are too important to do it: She considers it beneath her dignity to help with the housework now and again.
Farlex Partner Idioms Dictionary © Farlex 2017