>>> But it’s not as if someone is getting up in the morning and making a decision that they’re going to be a large person

This fallacy is a big problem with people claiming that various negative things in life are "not choices". The idea is that if you can't bring it about by "waking up one morning and deciding to be xxx" then it's not a choice.

This is plainly untrue. Many situations take a series of bad choices to bring about, and a corresponding series of good choices to fix. The fact that you can't simply decide get into a given situation instantly or decide to get out of it instantly doesn't mean that it's not a choice.