Maybe, but I'd suggest that it is more nurture than nature; and at the beginning, a person could go either way while learning to become comfortable in a gathered end hammock
But, once the habit is formed, changing the body's notion of what is comfortable would be something else. It gets to expect what it is used to. Just like which side of the bed to climb in and out of and which side to sleep on.
So, if you think there might be a WBBB in your future, start hammocking with your shoulder and feet oriented for it. Or make an offer for mugs' mirror image version.
Are Dream Dangerbirds sided the same way as WB Blackbirds?