I cannot see the level of discourse getting more refined and courteous, as the election season begins in earnest.
But then, maybe elections are not supposed to be about courtesy. Not even about honesty.
Elections are non-violent (for the most part!) civil wars and always have been!
Changing the sovereign is the trickiest part of government. Rome for example even their eastern flavor never adequately solved it.
Any party that can thrive only by creating balkanized groups has to inevitably turn out like this. With them, it is always “us against them,” never “we the People” and the “melting pot” with common shared ideals.