Conspiracy theory, mathanxiety. I am not a Birther or a 9/11 "truther" (i.e. liar) and your idea that the Protocols of the Elders of Zion/ Reds under the Bed years are the cause for me or Republicans to use words like professional/MEL/ Establishment as terms of suspicion is just as ridiculous as those two ideas. The sensible explanation is as follows:
Religious structures of social import and attendance at organised religious events tends to decline with increased wealth in society, even if those people maintain a strong private spirituality. As GOP voters tend to be more religious they are concentrated in the poorer part of the USA. This is well known.
All the worst poverty, etc. figures are in the red states of the south and midwest and their economy is still based more around manufacturing, agriculture and lower level service industries so a lot less of the people will be professionals, post-bachelor degree holders, and so on. It is a widely acknowledged fact that the upper middle class, who I refer to- i.e. doctors, scientists, academics, middle managers in state/fed govt agencies, school principals, not billionaires who donate more than these people's annual earnings to GOP super PACs for tax reasons- are very much more likely to vote Democrat.
Do you know how many people are in the John Birch Society or similar now? They just have zero influence on GOP politics. McCarthyism and anti-semitism is in their past. Anti-Catholicism: while I believe it is still harboured in the hearts of many due to their fundie beliefs, they realise that promoting life and family values in a democracy through overlapping consensus between different groups is the only way forward politically, and hating those who support their main ideas is exactly what liberals would want them to do so as they'd lap up the split vote and win all their electoral campaigns. RCC vote has been a great boost to the GOP since Roe and other social issues took centre stage; now the generation gap is opening up with young Catholics serious about getting a pro-life, traditionalist president and their older coreligionists continuing their own tradition (of lifelong Dem support, cf. unions, war, civil rights, other issues.)