keeper, i don't know that it's 'mean' genetics that produce a better wintering bee? us northerners are very fortunate to not have to worry about or deal with AHB. i remember one member's story, cracker, and the AHB bees went after his chickens, yikes!!!
the russian bees get a bad rap on this, (aggressive and mean) and folks really have no idea what they are talking about sometimes. are they gentle, yes and no, but i have chosen to keep them for various reasons; success in overwintering, mite and disease resistant, good honey producers and success year after year with them is good enough for me, and if i have to wear a veil or gloves to work them so be it. they are more 'sensitive' to all changes and have some quirks about them, and will let you know when you lift the lid. when they are happy, you could probably work them like any other bee.
as far as bees getting grumpy, all bees get grumpy for one reason or another, we as beeks ought to be able to figure out why within a short period of time why they are grumpy and resolve the issue.
i haul some of my russkie hives to my suburban residence. a lot of city ordinances require the keeping of gentle bees....oops....LOL. on occasion i have had one or two get pretty snarky, but they have never bothered my neighbors, just me, when the lid is lifted. i correct the problem. the truth is my neighbors are stung more by yellow jackets, wasps and hornets and even though some of our city neighbors would like to blame our bees for this, it's typically not the honey bee but the other aggressive bees.