Peil: I think Grams would have said to Jackie, “You have to lighten up.”
Some partisans undoubtedly thought Eastwood was funny and that the MSM should lighten up.
IF YOU ARE OFFENDED, SKIP OVER, OR lighten UP AND GET A LIFE.
"to make less heavy," figuratively "to make cheerful," mid-14c., from light (adj.1) + -en (1). Related: Lightened; lightening.
"shed light upon, illuminate, brighten," early 14c., from light (n.) -en (1). Meaning "to grow brighter" is late 14c. Of faces, expressions, etc., from 1795. Related: Lightened; lightening.