The states are won by a popular vote. Popular vote, not by county.
So you can draw the county lines any way you wish. You could draw them as octagons, squares, vertical columns, horizontal slices, or even by random zigzagging. It won't affect the Presidential vote because state electors are decided by popular vote, not county vote.
Saying the states were gerrymandered was funny. Some actually arguing that that county gerrymandering affects the Presidential vote is even more funny.