Contemptuous or rude treatment which excites or justifies resentment; marked disrespect; a purposed indignity; insult
If something is an affront to you, it is an obvious insult to you. It's an affront to human dignity to keep someone alive like this = insult. to offend or insult someone, especially by not showing respect (afronter, from affrontare , from ad- + frons ). a remark or action that offends or insults someone affront to