It's fine, you aren't touching anything. Just try and avoid touching stiles, gates or fences with your hands as much as you can. I ride tracks, NCN, canal (even narrower) bridleways and so on and there has been no issue. I would advise on a bell as this alerts folk that you are coming. As much as I hate bells, I fitted one last year and it's invaluable for giving plenty of warning. Folk have been great, and have stepped right out of the way. Only issue is dopey dog owners, but that's the same in normal times. I get whole families covering the trail left to right, so the bell soon shifts the. Not sure what they think when I do a little 'ting' and a thundering MTB comes past.
I'm tending to use the 'horse' route at various gates rather than the stile where I can, jump off bike, hop over one or two logs, then off, rather than squeeze through. I have one gate I can't avoid, but so far I've been OK. All my clothing straight into the wash as per usual, me washed, bike washed. Nothing that I don't do anyway.
supermarkets are the worst places. I'm being very careful which shops I go in.