A cartoon that has escaped so far

The cartoon below has been doing the rounds for at least ten years, according to my knowledge.  It is well drawn and  I laugh at it whenever I see it pop up again.  But how come it has not provoked great wrath over "stereotyping" etc.

I think I know why.  Nobody knows who drew it and there is no point in getting outraged if you can't threaten the author over it in some way.  Getting an incautious person to lose their job is the big turn-on for correctness critics so without that their outrage doesn't exist.