Include the context! You'll get better, more relevant answers if people know what you're asking about!
Background:
"We put the _____ in _____" is a fairly common phrase where the first blank is a part of the second word. It usually has a slightly funny/punny meaning, but it can be either a positive pun or a negative one.
A positive example might be an art museum saying "We put the 'art' in 'party.'" (notice the word "art" is in the middle of the word pARTy) or a sandwich shop saying "We put the 'deli' in 'delicious.'"
A more negative, sarcastic example is "They put the 'fun' in 'funeral.'" (because funerals are not supposed to be fun) or "That guy puts the 'hot' in 'psychotic.'"
So, to your question - after last week's incident, there is a meme going around that says "Fly United Airlines! We put the 'hospital' in 'hospitality'!" Airlines are part of the "hospitality industry." Generally speaking, hospitality providers (airlines, hotels, etc) are not supposed to bring you anywhere near a hospital - but United's actions started a chain of events that put one of their customers (Mr. Dao) in the hospital with serious injuries. This is a joke based on that type of phrase, saying that United Airlines did treat not their customers correctly and that if you fly on United, you might end up in a hospital.