The nice thing about jokes is that you can, in good conscience, make them about any subject, as long as you actually are joking and don't mean any harm. The worst thing that could happen is that you offend someone, and being offended is not a very painful emotion, and certainly not a harmful emotion.
Please don't ruin humour by policing what people can and can't say.
Please don't ruin humour by policing what people can and can't say.
The joke was not very good, though.