What has bothered me in Georgia and primaries, is that the number of registered republican voters significantly

[Ocelot II]

3. The Democratic primaries were effectively uncontested.

There was never any question as to the outcome, and apart from some performative "uncommitted" voting none of the challengers made a dent in his vote totals. Where the result is a foregone conclusion a lot of people don't vote. On the GOP side, however, while it was always clear that Trump would eventually win, there seemed to be a fair number of voters who wanted to express their preference for a Republican who isn't him. I don't think this is evidence of Democratic apathy at all.