The so called switch occurred over a 50 year period. The most common argument of the switch was with the Dixiecrats, but only two Dixiecrats switched with Strom maintaining a seat. The political affiliations were hardly aligned on a spectrum then and took time to develop into the tribalism of a two party spectrum that we have today. You are also using words like liberal and conservative in an anachronistic way. Classical liberalism has always and still is a major foundation to Republicans. Contemporary definitions of Conservatism is at odds with liberalism because of the inherent nature of individual liberty not being absolute, but subject to an authority of an established government. I believe it leads to the fragmentation and why most common sense individuals identify with the Libertarian party; albeit unfortunately also pragmatists and still end up leaning right and Republican.The party switch isn’t a myth depending on if it is explained in a historically accurate way. Originally the political parties existed on a spectrum. You has liberal Republicans and conservative Democrats (Vice Versa). Factions, within these parties began to switch to the side that they felt more aligned with their values. Thus, some Southern Democrats joined the Republican party as did many Southern supporters. That doesn’t mean that all Republicans became racist and Democrats became angels. It just means that factions realigned and the Democrats became more consciously liberal and the republicans became more consciously conservative. Besides, I am sure that you cant miss the irony or a bunch of Trump supporting Republicans protected statues of Confederate Democrats, right? Again, political realignment is a historical fact.