Of course everyone should wash their hands every time they use the loo (and it always surprises me that some people don't), but as far as Covid is concerned, it doesn't matter whether someone has used the loo or the kettle - it is general cleanliness that matters, as well as wearing masks or ventilating communal areas.
Cleopanda I also think that if you are reduced to tears because of what someone else's colleague may or may not have done in their workplace, you might be better off having an Internet break for a while. We can't all moderate our responses to a general point in case it distresses someone who is clearly very sensitive, yet it is not nice to feel that we may have done so. I am neither complacent nor derisive - I just feel that the current climate, in which some people feel the need/desire to report others for transgressions which are unproven and sometimes imagined, is deeply unpleasant and dangerous.