“Ah… isn’t it nice just to stand up like this!? Right!?”
“Sure, but you’re destroying the chair with your dirty boots, don’t you think it’s better to sit down?”
“Maybe, but then again it feels better to stand up in it, softer for my feet.”
“I don’t really understand what you’re doing here, care to explain.”
“You’re questioning my role to exists!?”
“Hmm… no, not really, I’m simply asking why you came into my office and started to stand in my chair while I’m preparing for a meeting.”
“Ah, you should know that I’m a psychopath.”
“That makes it so much clearer.”
... and there you have it.
Chairs are made for sitting. You could half stand if you have a good chair that you can raise and lower to a greater extent. But otherwise just sit down on chairs and you’re “normal”.