Yeah, in Ohio we've had a Republican trifecta virtually thirty years, not counting the one or two time the governor was a Democrat or the senate flipped blue for two years, it's closer to 40.
In my lifetime I've never seen "the other team" gerrymander because the Republicans gerrymandered themselves into a perpetual power cycle. I'm opposed to either party doing it, but the reason the Republicans are currently in the hot seat is because they've been doing it since Reagan.
Of course gerrymandering is bad when either party does it and, again here in Ohio, our supreme court has ruled their maps unconstitutional and they've just... ignored the ruling. Then they changed the way the wording was on a bill to end their illegal gerrymandering so that voters who were opposed accidentally voted yes because of the wording.
Republicans are cheaters, through and through, and they manufactured the "Democrats cheat by adding dead people to the rolls or illegal immigrants are voting" bullstuff (all of which is demonstrably untrue) so they could draw away attention away from their own cheating.