Something inconsiderate that chairies do, is when you are trying to have a civil conversation with them, they insist on remaining in a standing position, even if the situation clearly calls for a resting squat.
Which mean you end up having to bend you neck to look straight up at them.
So here I am, being a good influence on them, showing how to do a proper resting squat, like nature intended. And they don't just damage their own bodies by refusing to squat, they are damaging my neck too.

This is what I mean by second-hand chair. Their inability to move their own legs and hips in a natural human form is causing collateral damage to my body.
This is how just spending time with chairies can damage your health.