Rational arguments don't always work when it comes to emotive topics. However, for what it's worth:
You might be stuck behind a cyclist for 8 seconds. Usually much, much less. I know it seems like a long time, but it’s not. It’s 8 seconds. That’s with heavy oncoming traffic. However, you’re not stopped for that time, you’re traveling at 20mph. This means that slowing down, waiting for traffic to clear and passing the cyclist safely costs you about four seconds… max. Do you want to risk my life (permanently) and you being a murderer (forever) for four seconds? Really?
[...]
Imagine if all those people on bikes that you hate commuted downtown one-per-car. What would that do to your commute? What would that do to your parking availability downtown? What would those additional heavy cars do the pavement condition (remember that my bike doesn’t wear the road at all) ? I’ll give you a hint … you’re a lot better off with the cyclists. They’re doing you a favor. They’re saving you money. They’re paying the same as you for that road, but using it less. You should be thanking them. You should be handing me a cupcake through the window.
Ok, so someone tell me again why this is even an issue, let alone an emotive one?
Plenty more here: You're going to kill someone
Of course, soon after I post this, I (barely) see a Darwin Award candidate on a black TT bike, dressed in black on a dark street without a headlamp. Idiot.