When Amber was in South Africa, she helped "resurface" hut floors (with cow manure)--with her hands!
Even that was not infra dig. It was an honour.
Infra dig: beneath one's sense of dignity or unbecoming.
Now, I have seen some young ladies gentlemen conduct themselves in a manner that I consider infra dig.
I have been guilty of the same. Of course, this new year I am desirous of being a persona grata, not infra dig.