"Travis left Chris" with The Bros
Both Madison and Alicia said that in the season finale, as if Travis just got fed up with Chris and said, "See ya, I'm gonna abandon you and go walk off alone while you travel the perilous, lawless Mexican countryside with two massive idiots. Have a nice life!"
This is a repeating thing in the Walking Dead, where characters seemingly cannot or do not communicate simple things. It's like Rick and his group when they first get to Alexandria, and the Alexandrians don't know why Rick's people are so on edge and suspicious.
Half their problems could have been avoided with a simple explanation: "Hey guys, we're sorry that we're jumpy and suspicious of you, but we literally just escaped from a group of cannibals who ate our friend, and before that we encountered several other groups of psychopaths who killed our other friends. We know how insane and dangerous it is out there, while you guys have been behind your walls this whole time, so be patient with us."
There's a huge difference between "Travis abandoned Chris" and the story we saw, which was Travis losing his grip on his son, Chris believing his dad was too soft for the new world, and Travis literally begging Chris to stay with him as The Bros took off and left Travis alone on a farm with no vehicle.
People would've been a lot more sympathetic if they knew the idiot Bros killed their own friend, even though Travis was tending his wounds, and turned gullible Chris against his dad.
But nah...they just let everyone believe Travis abandoned his kid with two paste-eaters, then went ballistic when he heard his kid was dead.