BPL rules (and most of the rest of the US) discriminate against people who can't concentrate with their feet flat on the floor.
I'm not allowed to not wear shoes. I'm not allowed to sit cross-legged in an armchair. I'm not allowed to sit on my feet. I'm not allowed to sit sideways and drape my legs over the arm of the chair. It's upright at-desk position (despite not being at a desk) or nothing.
I cannot sit at a right angle. I'm not allowed to get anything fucking done here. I'm going to sit on the floor for a bit but I expect I'll be told I'm not allowed to do that, either. And I still have to put my fucking shoes on. For reasons.