He may just be an ass, but you may want to tell Sister to get hubby to a doctor to get checked out for serious heart issues or cancer, serious blood clots, etc. Years ago I had a friend "go off" on me and I was steamed, but calm and cool, just thought it extremely bizarre as it was out of character for this person. Turns out they had a serious heart condition that they caught just in time.

More recently a different friend (who I've temporarily, at least, shelved) had taken to screaming at the top of his lungs if you said anything that set him off, usually after he'd been drinking, too. Again, bizarre, out of character and easy to chalk up to developing alcoholism. This one had an aggressive cancer diagnosis shortly after (hopefully eradicated after surgery). I'm sure this one was as a result of the jabs.

My point being, and it's something I've heard for many years, that when people develop a potentially fatal disease, they often have these types of bizarre personality changes. I don't know if that's the case with Sister's hubby, but I'm seeing more personality changes in people I've known for years who have taken the jabs. You decide if it's worth sending Sister a text on this even if you want to hit pause (or stop) on your friendship at this time. It's just something you may want to consider.