Your hands are filthy regardless, you’re on your way IN to the bathroom so you very likely haven’t washed your hands but you’ve touched a LOT of things. Phones, keyboards, door handles, banisters etc. Pulling one more door open is not adding any meaningful contamination. If you are that concerned about one door handle, you should be VERY concerned about the state your hand is already in and thus would need to wash your hands before using the other facilities anyway.
You’re being overly paranoid. Your junk is not going to explode because it interacted with real world pathogens.
Hard disagree.