The problem with a tissue is that you a) don’t always have one available while you’re out in public and suddenly need to cough or sneeze b) can’t realistically walk around with a tissue in front of your face while talking and breathing (both of which produce respiratory droplets), c) can’t use a tissue if your hands are in use carrying something, and d) a simple tissue will definitely not do as well reducing the volume and range of respiratory droplets as a multi-layer woven mask strapped to your face.
Would it be better than nothing? I would assume so, yes. But is it practical to walk through the grocery store with a box of Kleenex pulling out fresh ones for every breath, every word spoken, every cough, every sneeze, no matter what else you’re doing or carrying? I don’t think that’s realistic. Wearing a properly made, properly worn disposable mask and throwing it away after the grocery store trip is complete is vastly more realistic and effective.
Ahhh, I guess you’ve solved all the worlds’ problems. I don’t know how we ever got along without masks before.
This may be your new normal, and you are welcome to it.
So are you actually proposing sneezing into a mask and spending the rest of the day with snot all over your face?