system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that for many people their behavior completely changes when they are in a car or on the internet?
gpt
It's about anonymity and vulnerability.

On the internet, you're anonymous and well outside the reach of the person you're talking to, so when people disagree, they tend to be a lot more confrontational and aggressive... because it's easy to be aggressive and confrontational when there's no chance of being punched in the face. 

In the real world if you're 5" tall and weigh 90lbs soaking wet, you're probably not going to tell a 6"5 250lb guy that he's full of shit, even if that's what you think. Online, who cares? What's he going to do?

The flip side is it's also much easier to be abusive or aggressive (or honest) when the person you're communicating with is just words on a screen. The internet dehumanizes the person you're speaking to

Basically,It's really easy to watch a bad youtube video and tell xXUsernameXx that they're a talentless piece of shit. It's a different thing to watch that same video and then walk up to Jenny, the 14 year old girl who makes Minecraft videos to take her mind off her parent's divorce...and look her in the eye and say "You're a talentless piece of shit."

As for cars? Well, the same applies. You're in a big, locked metal box that's basically half suit of armor, half escape pod. Lean on your horn, give the middle finger, because you're at your turning and will never see whoever's driving that car again.. and fuck that fucking stupid fucking Ford that cut you off in traffic, because it's a stupid fucking Ford...not Jenny's Mom who's had a really bad day and distracted because she doesn't know how she's going to make rent that week.