Avoid Sentimentality (but what is it?)

From Paris Review interview with Kenzaburo Or

"INTERVIEWER

What do you mean by sentimentality?

OE

The best definition comes from Flannery O’Connor. She said that sentimentality is an attitude that does not confront reality squarely in the face. To feel sorry for handicapped people, she said, is akin to hiding them. She linked this kind of harmful sentimentality to the Nazi’s extermination of the handicapped during World War II."