When I imagine his inner thoughts when listening to the clip, it sounds clearly like joking to me. Without any backtracking.
We should not rely on imagining other people's inner thoughts... Not a very sound method.
> And I see, like, 'kikes are ruining everything'. [laughs] Good—good—good job... You're making your movement look like you're not full of Nazis! Great! Bravo!"
Is it your genuine belief that the statement "You're making your movement look like you're not full of Nazis" was meant non-sarcastically? Do you genuinely believe that Benjamin stated that statements like "kikes are ruining everything" among the Alt-Right makes the group not look like Nazis?
Again, to say "yes" to these questions requires willful ignorance in my opinion.