maybe I am naturally hysterical in the same way silver is naturally antibacterial...I do generally feel more sane after lunch.
I work in the field of drug development and I guess I therefore spend more time worrying about this sort of thing than the average person. It seems ridiculous for the government to spent millions on research into beating drug resistance while doing nothing to reduce the casual use of unnecessary antibac products.
Whether or not a particular treatment can cause the development of resistance depends on the treatment.
Sunlight is unlikely to worsen resistance as it has been around for a while...bacteria have already made their peace with it.
Extreme heat (100 + degrees) is also not a problem. Moderate heat easily could be though. The bacteria can increase their heat tolerance by exposure to moderate heat.
Bleach and other chemicals that directly oxidize the crap out of things can't promote resistance as the bug would have to move to something other than DNA in order to cope. On the minus side, it might just be a bad idea to bleach your skin. Many chemicals fall into this category - bad for bacteria, bad for us. So bleaching your floor is fine...probably the anti-bac furniture sprays are also fine (but I wouldn't inhale them...).
So then there is the category of things you can put on yourself, meaning they don't attack your cells in ways they can't defeat. These chemicals don't attack the fundamental structure of the cells (because we share that with the bugs) so instead they compromise them in other ways. These ARE ways that the bugs can combat through developing resistance.
So Antibac deodorant either falls into the 'fundamental attack' class in which case don't spray it on your skin....or it falls into the 'non-fundamental attack' in which case it is promoting resistance - and so don't spray it on your skin.