It’s a turn signal. It signals an intent to change lanes, but that doesn’t mean it’s always safe or courteous to do so. If your speeds are mismatched, it’s not irrational for a car going faster than you in that lane to speed up so you have space to merge behind them.
If you merge in front of them anyway, they’re still responsible for not hitting you, but you still cut them off.
We’ve all been cut off and we’ve all probably cut somebody else off too. Driving in traffic kind of sucks.
Yelling at the other cars the whole trip…