Lisa Lampenali or John Tosh's brand of humor may be harsh, but here's the catch: most of it is steeped in racial sterotypes across various cultures AND is applied equally among the various races. Neither comedian necessarily singles out a particular racial, cultural or religious group except when it comes to poking fun at those cultural stereotypes we all are keenly aware of. John Tosh in particular mainly pokes fun at people who flat out does stupid things. Sometimes both comedians do hit below the belt, but when I see a Black man/woman, a White man/woman, a Hispanic man/woman, a Jew or Muslim laughing their butts off at a joke that was directed NOT at them personally and not meant as a put down to their race, gender, religion or culture but simply as an aknowledgement that "Yeah, we do do that", then I'm fine with the joke because they're fine with it. We all can laugh about it with the knowledge that we all came away with the same cultural understanding of each other.
So, I get that sometimes you just have to laugh about it, but this placing a noose around the neck of a Black historical monument isn't funny. As a Black man, I would never find something like that funny any more than I've find humor in placing a noose around the neck of a status of Thomas Jefferson (for the clear connotation of him being a n-lover). It's offensive to me regardless moreso for the psychological impact such an act carries with it.
It's not funny. No matter how hard yourself and others try to defend it, it's just not funny.