I'm with Mick-Talbot on this - I hate to hear people blowing their noses in public.
I never blow my nose, but if i have a cold I use tissues.
However, I always carry a clean hankie for the occasions when any ladies of my aquaintance may need one.
When I worked in an ofice with twenty-three women - as the only man - I was often the 'go to' individual to discuss personal issues, my discretion was legendary. That meant that i would usually ask for a box of hankies for Christmas, to replace the donated ones from the year gone by - although one frequent recipient always returned my hankie, washed and ironed.
On the subject - unless you know for a fact that you have pound coins up your nose, there is no need to peep into your hankie / tissue when you have blown!!!!
And don't give me that 'checking for infections' guff - if you must do it, go to the loo and do it there!!!