How could you possibly come to the conclusion that "jokes which reinforce the current power structure" are equivalent to jokes about dead babies, torture or genocide? Especially after I opened my comment explaining that yes, in fact, you can make a joke about any subject matter. It's like you didn't even read my comment at all, you just glanced a keyword signifying a binary position and then you decided to dump your preconceived opinion here.

What do you think about the assymetry of, for example, the classic "[A], [B], [C] walk into a bar" jokes, where an ethnic /racial/profession/etc group C is crudely belittled and made fun of?

In practice, such jokes are seen as acceptable if C is a major/nonthreatened group, but the exact same joke would be offensive if C is swapped to a smaller/more vulnerable faction - does that match what you feel?