If some ordinary families, such as adults, are office workers, and their daily life is just sweating, there is no great pollution to clothes and underwear, then all clothes will be washed together.
Like myself and my colleagues and friends around me, there is actually not so much pressure. Now I go to work every day, and adults at home don't do farm work or other special jobs. Children also go to school every day. Our clothes are not very dirty, they are basically sweat stains and dust, so the clothes of all families are washed by washing machines.
Moreover, the current care is in place after all, and "residues" such as menstruation, urine and poop can be filtered out under the protection of the first layer. Like me, buy some laundry detergent with higher quality and stronger cleaning ability. Basically, I think these basic harmful substances can be removed. Our immune protection function is not that bad, so I think it can still be machine washed together.
To tell the truth, I have insisted on washing underwear at home by hand for a period of time (about 2 months), which I think is more hygienic and healthy. But then I couldn't hold on. Because I really don't want to, I think it's a waste of time, and I think I need to keep those powerful washing machines with thousands of dollars. Instead, I use my hands. Isn't that a waste of resources? So I gave up and threw it directly into the washing machine. Anyway, I don't feel anything particularly unhealthy at present. As far as I know, there are very few people who can wash separately.
I think of another "popular science video" about raising children, saying how many grams of protein, how many grams of carbohydrates and how many grams of vegetables should be eaten every day according to the scientific parenting introduced by books or brick doctors. If ordinary people tell their families to do this, they should weigh their children first, so it's strange that their families don't take you to a mental hospital. So, according to the book, in the end, I feel like a pig. The same goes for washing clothes. How can there be so much pure hygiene and health in reality? If you choose a better washing machine, use a better laundry detergent, wrap your underwear in a strong laundry bag, and then wash it with a better disinfectant machine. Replace it every day and clean it up in time. If the washing machine is dirty, the residual bacteria and viruses will not threaten our health.
Of course, if someone's clothes are stained with a lot of stains and oil stains because of work or life, it is difficult to wash them with a washing machine, which may pollute other clothes, then underwear should not be washed with these clothes by machine, otherwise it will really pollute our underwear and affect our health over time.
Like a relative of mine, he works in a first-line factory every day. There are a lot of black oil stains and all kinds of dust on his clothes. He washes clothes by hand, at most, he washes them many times and then dehydrates them with a washing machine. If children's clothes are stained with too much urine and poop, wash them by hand, and don't mix them with other underwear and wash them by machine. Also, for example, if there is a lot of mud on the clothes for farm work, don't wash them with underwear, because the naked eye can see things that are too dirty, it is difficult to clean the washing machine, and it will pollute the washing machine and other clothes.
In short, under normal circumstances, I think underwear can still be washed with other clothes, and washing clothes with a washing machine can also filter out many harmful substances, which will not pose a great threat to our health.