B.B.
I'm sure it's hard for you to watch. I have two children and my 6 month old just started communicating when he is upset (like when he is tired of being in the carseat or when his sister takes away a toy from him). Although it sounds like your little guy is much more passionate about expressing himself. I wouldn't ignore the behavior in my opinion because he is too young. But in the car you could try music, singing songs, talking to him, toys, pacifiers. I have tried it all because my first child hated the car and it was miserable to even leave the house. If he is screaming at home, he might just be overtired, have gas or be teething. It is so hard to tell with babies. Just give him lots of love and know that this soon will pass. These things are always phases and it's rough while you are in the middle of it, but soon it will all be in the past. Good luck!