[Leftism is Mentally Deranged]

The reason for the "Macaca" hypocrisy was so that the left can go around saying that Allen is racist. This is their standard operating procedure. They listen to and record every word spoken and written by a conservative, and then try to find something for which they can destroy him/her. If they don't find something, they make something up. Their willing accomplices in the media immediately seize the opportunity and paint his/her words as racist.
Later, when it serves their marxist purposes, they remind the readers of the "racist" comments which weren't racist at all, but trumpted up by the left.

[Robert A Cook PE]

Further, continuing your excellent summary, the left FERVENTLY BELIVES (as a matter of faith and morals) that their conservative enemies ARE racists and bigots who hate minorities.

Therefore, since Allen "obviously" (had to) reject his Jewish ancestry (to appeal to his barbaric and racist Christian supports) this particular (liberal) newscaster "had to" expose this to attack Allen, so HIS reply can be exposed.

Of course, what WILL be promoted (by the liberal press) is that Allen will be "exposed" as a Jewish-hating racist by publicizing his answer to her racist question as racist itself!