Don't make your assumption a fact. You don't know and you can't know if Irish was trying to invoke Nazi Germany with that comment.
If that comment is glib, stupid and utterly ****ing ridiculous I leave for others to decide.
I find it utterly ridiculous though to trash Irish for using a political ideology while the right is throwing around the words socialism and communism freely. I don't see your uproar there.
Germany used Nazism in a way the former USSR used the word socialism. In both countries killing for political purpose was on the daily agenda. In both countries millions of people died in an ideological , domestic war. What took in the USSR decades happened in Germany in a relative short span. Neither was politically what they claimed to be.
Americans don't know any socialism or communism unless it is associated with countries (regardless if they are or not) like Cuba, the former USSR, maybe Venezuela, the former North Vietnam and North Korea. Socialism and communism in the minds of Americans is indoctrination, imprisonment, killing for political purposes, no free speech, no human rights, no justice.
If - under your assumption that Irish was automatically invoking Nazi Germany because America doesn't know any better - a right winger uses the words 'socialist', 'socialism', 'communist' and 'communism' to describe a liberal and/or the President why aren't you outraged then?