Do both sides do it equally?

Pretty sure Yang never has to defend his glib statements in detail.

Quick Google notes the Republicans had used gerrymandering quite effectively to their advantage through 2012 (6% advantage?), even 2016, and Dem efforts to "claw" that back since have at some points down to 2% GOP advantage

https://www.vox.com/22961590/redistricting-gerrymandering-house-2022-mid...

 (while Biden'a attempt to ban the practice was filibustered by the Senate)

BusInsider explains (2017):

https://www.businessinsider.com/partisan-gerrymandering-has-benefited-re...

Michigan provides a good example of how the formula works.

Last fall, voters statewide split their ballots essentially 50-50 between Republican and Democratic state House candidates. Yet Republicans won 57 percent of the House seats, claiming 63 seats to the Democrats’ 47. That amounted to an efficiency gap of 10.3 percent in favor of Michigan’s Republicans, one of the highest advantages among all states.

That also marked the third straight Michigan House election since redistricting with double-digit efficiency gaps favoring Republicans. Stephanopoulos said such a trend is “virtually unprecedented” and indicative of a durable Republican advantage

Sam Wang analyzes/debunks the "both sides" bit:

https://election.princeton.edu/2012/12/30/gerrymanders-part-1-busting-th...

Culture war redistricting:

Studies find Americans increasingly geographically divided by political party. This segregation is visible on county-by-county election maps, where big metropolitan areas tend to be colored deep blue, and rural areas deep red.

Gwinnett and Forsyth are next to each other, affected by many of the same cultural and economic trends, yet in 2020 Gwinnett voted 58% for President Biden and Forsyth voted 65% for Trump.

It's not clear from studies how often people move specifically for political reasons, but our random interviews found people who said they did. 

Esther Harding lived in Gwinnett years ago, when its populace was more Republican. After seeing the county change, she moved a year and a half ago to a new neighborhood in Forsyth.

This recently built neighborhood in Forsyth County, Ga., is in a rapidly growing area that now has its own new state legislative district and is one of the areas where an NPR team went door to door talking with voters.

Steve Inskeep/NPR

"Forsyth is a great county to live in," she said. "It's not as Democratic ruled as Gwinnett is. ... That's super important for us because, you know, we have values and in Gwinnett, you don't get those."

Asked which values she meant, she listed opposition to illegal immigration, opposition to abortion and her concern about "what the kids are being taught in school." 

Her main concern is the governor's race. 

"[I'm] just praying that Stacey Abrams won't take over," she said, referring to the Democratic candidate. Harding is concerned enough about this to support incumbent Republican Gov. Brian Kemp, even though she's unhappy with Kemp for affirming Trump's 2020 defeat.

Her next-door neighbor told us she moved from Los Angeles to Forsyth County partly because LA was "so Democratic," allowing too much "freedom" and "sexuality."

https://www.npr.org/2022/05/22/1100072832/georgia-voters-gwinnett-forsyth-2022-midterm-elections

Also Forsyth: https://www.npr.org/2017/12/08/569156832/the-racial-cleansing-that-drove-1-100-black-residents-out-of-forsyth-county-ga