...someone who disinfects his iPhone probably disinfects other things thus weakening his immune system
sure if you just disinfected your iPhone and nothing else that would probably be fine
I use alcohol to clean my phone at least twice a week. Not to get rid of germs, but to cleanse the oily residue that builds up by handing the phone. I also do this with my mouse and keyboard. You're exposed to so many microorganisms that disinfecting a few objects, even on a daily basis, only makes up a miniscule amount of exposures. It does not 'weaken' your immune system because the T-cells have already been made to respond with antigen-specific proteins-even upon re-exposure to a specific ailment. Disinfecting any surface, even for long periods of time is not going to suddenly make them relinquish their 'memory.' I must assume then that 'weaken' was not the word you or anyone else was looking for. Rather, the pathogens will not contribute to their 'memory.' Even so, you must consider the number that enter your system; this number is far less than you might expect.
The rest of my family, including myself, use alcohol-based hand sanitizers throughout the day. After all, it is to be expected at a hospital. I spoke with my father on the phone earlier (this topic is what made me curious) and asked him how many times he uses the hand gel daily. To which he responded, "If I had to guess, I would say about twenty times." Hospitals already have a bad reputation for making healthy people sick, but judging by this thread, we should just drop all forms of our sanitation products.
I don't want to appear a belligerent brute, but disinfecting your iPhone and/or several other items is not going to do anything to your immune system. There is no problem here, nor is there a need to dissuade the OP, or anyone else, from disinfecting their phones.