It's hard to find the right words for this, but I would sincerely reevaluate your perspective.

A surprising number of people thrift / buy used clothes. Between thrift stores and consignment shops, more people shop there than Department stores (30% vs 21%).

https://www.census.gov/newsroom/stories/thrift-store-day.htm...

It's currently popular among younger people as a push against "fast fashion". People want clothes that are unique and affordable, and their only options are thrift stores or color blocks from Uniqlo.

This is the "kind of person" who buys used clothes:

https://www.youtube.com/watch?v=nihjDIczdCA

Fast fashion is likely undermining used clothes, since they degrade quickly to not being wearable, but still have the same landfill degradation problems as other textiles.

You sound like a terrible character, and you should be ashamed about yourself.

He (I am confidently making this assumption, feel free to to correct if wrong) also clearly has never had kids or hand me downs

You do know there’s such a thing as a washing machine?

It takes dirty clothes and removed the dirt and nothing dangerous will survive the detergent and hot water.

Use the dryer to kill bedbugs, lice, ticks, etc. In this case bedbugs are probably of greatest concern.