The concern about antibacterial chemicals isn't that they promote antibiotic resistance, but rather that they reduce our exposure to a wider range of bacteria, and can also exacerbate auto-immune diseases. Also, once a strain arrives that can tolerate the chemicals, you have basically handed it your entire household to multiply in, whereas in an environment without such chemicals, it would have to fight other bacteria for living-space.
The vast majority of bacteria species are harmless to humans; there are also far more species of bacteria that are beneficial to human health than harmful - your digestive tract relies on bacteria to function correctly. Germicides are useful in clinical settings, but in the home, they are the equivalent of razing a forest to the ground just to avoid the risk of getting stung by the occasional nettle.
As for facemasks, the advice was, and remains, that a regular, non-medical grade facemask is not very effective in protecting you from infection, but is useful in protecting others around you from catching any respiratory infection you might have. There was some muddled messaging about masks in the UK at the beginning of the pandemic, in a misguided attempt to curb private stockpiling of medical masks by telling people they weren’t useful - this messaging later came back to haunt the government when it had to ask people to wear masks in public to try limit infection. The message here in Ireland was more truthful: bulk-buying medical-grade masks for personal use wasn’t a good idea simply because they were in very short supply globally and were needed for front-line medical staff.
I don’t think we’ll see people wearing masks for flu/colds in future, simply because masks are the most visible reminder of Covid-19. Just as the 1917-20 influenza epidemic was quickly erased from public memory, nobody will want to be reminded of Covid once it has passed.