That is so stupid. I hate people that do that, and I've assaulted a minimum of 4 people for doing the same thing.
Yeah, they're all brave when they're surrounded by their big metal cage, but when the 6 foot, 92kg angry armored bastard is smashing their window in, they rethink their actions. I've already broken 2 helmets because of people who think that winding up their windows and locking their doors will help them.
I'm normally very polite (I wave to everyone when I finish lane filtering), but when people do this stuff I see red.
We're faster than you, smaller and more vulnerable. When we get rear ended by some wanker who missed the red light, we don't just exchange insurance details, we go to hospital, or a hole in the ground. Filtering removes this risk. Sure, I don't agree with wankers that do 30km/h faster than traffic that are doing 80km/h whilst ripping wing mirrors off (ie lane splitting), but FILTERING through traffic at a red light only makes life easier for people.
Don't try and debate this with me, I've only just had the last pins removed from my body because of someone who decided I didn't deserve the road as much as he did. I was cut off in the wet. Braked hard, headshake, then I'm rolling down the freeway.
BTW, I do NOT condone violence. But if you try and kill me, I will make sure you never do it again.