Was Jesus advocating fratricide?

Nope. He was saying you need to prioritize following him over all else because end-days were nigh. It was a statement that there will be divisions and strife, but you needed to follow him if you wanted to survive Armageddon. Think not for tomorrow (i.e. since everything was going to be destroyed and renewed anyway, in the immediate future (~30AD). Similar to other cult leaders throughout history (without the suicide pacts, of course).

But that is not the peaceful, harmonious Jesus that most xians would have you believe in. They're more likely to quote "the meek shall inherit the Earth". They skip around various NT books all in one talk, taking many things out of context, because if they didn't then no one could believe in any of it (except people like my fundy ex-coworker). Then it becomes much simpler to say "just be nice to people", and skip the whole dogma bit. Today it's a huge enterprise, and there's no money in it if people skip the pews and go straight to "don't be an asshole". That also may have been true in the first century...I'm sure Yeshu was offered food wherever he went, as long as he delivered sermons. A lot easier than working as a fisherman or carpenter.

And then, of course, there is the fact that he actually failed to meet the criteria to be "the Savior", which is why Judaism is still a thing. The Jews are still awaiting the Messiah because they know Yeshu didn't satisfy the prophesy. (Moonglade on TMF did an excellent, lengthy, breakdown of that.)