ummmm is quite right - what appears as humour in speech, with vocal inflection and facial expression to accompany it, can loose any semblence of humour in print - as any regular poster on the AB knows quite well.
I have fallen foul of writing something that has been understood in a way different from that intended, on several occasions.
That said, if I were a politician and by definition accountable to the public, and by definition a defender of others, and by further definition a good communicator, i would not need to trouble my thoughts about whether such a post was appropriate in any way shape or form - much less have to apologise for being misguided.
This manis either devoid of what can reasonably called a sense of humour, or he is sufficiently insenstivie as to think such a remark would be considered amusing by anyone at all anywhere,. or he is a right-wing bigot who doesn't care if his observations upset anyone.
Any or all of these call his fitness for public office into serious question.
So yes, for those reasons, it is worse than any sick jokes.