I think the caveat here is timing and audience. Most people aren't adverse to a good dark joke as long as they know everyone involved doesn't actually think that way. My roommate is black and I have Italian heritage, we occasionally say slightly racist shit to each other in good humor but know each other's limit. This is after dozens of hours of deep dialogue about systemic racism and similar topics.

Of course the dude who opens up a party with dead baby jokes or the like is definitely not the brightest bulb.