I didn't mean to be flippant and sorry if it came across that way.
I think we can all check and dismiss our judgement, it's an ongoing endeavour. The difficulty (that therapy can help with) is recognising the subtle judgements so engrained in our psyche that we don't recognise then.
In the case here, its very obvious judgement that you yourself easily recognise op. So there is no reason why you can't 'just drop your judgement'. You recognise it, we've discussed here now unhelpful it is, so you could acknowledge that and stop.
Thats different to (as an example) a man who's judgemental towards his ex's "soft" parenting because of layers of issues in his own upbringing. That's an example where someone might not even see that their thoughts (as therefore behaviour) are bases on the judgement of others. Which us infact a judgement of oneself.
This is veerying into the tertiary of armchair psycobabble now. But suffice to say, checking and trying to stop your judgement of DH will help you understand that controlling his behaviour isn't going to solve much.
As PP said, you can only control your response to his behaviour. That might mean reassessing your relationship as a whole. In your 70s, I understand that the balance of likelihood is that you'll put up with a lot rather than leave. So be it.
- Maybe you throw away his shoes that you think are infected.
- Maybe you spray his shoes because it bothers you.
- Maybe you insist on am extension and second bathroom so you don't share barefoot space
- Maybe you throw away every discarded sock.
- Maybe you insist on separate bedrooms
- Maybe you spend less time in his company
Maybe these actions, without extended discussion or judgement attached, will help DH see how his behaviour affects (and discusts) you and so he will change his behaviour.