Unlike you I wasn't bragging either, I was just stating a FACT over a simple skill many acquire at a young age.
Just because you have no skill in certain simple things doesn't mean the rest are devoid of such.
JD, it's a surgical tubing style SLINGSHOT, not rocket science.
You know, your body is out of jail, but your mind isn't. You're still dealing with people as if it is a prison society with a macho ego style pecking order. Not every statement someone makes is a challenge or an attempted affront at your ego. You're back in free society now, so act like it.