As somebody who bikes and drives, I strongly object to both your behaviour and your assertion that it is harmless.

If I'm in a car on a through street, and someone coming from my right blows a stop sign or light and turns onto my street, even if they are on the shoulder, it startles me. If I'm close, and I don't know for sure they are going to stay on the shoulder, I might think they didn't notice me, and are about to cross in front of me or merge into my lane, so I might make a panic stop, causing me to skid, or causing, traffic chaos behind me, or I might reflexively swerve to the left without having time to shoulder check. Please don't do that - in your ignorance and blithe confidence, you're causing more stress and risk than you realize.

And if I'm on a bike on the through street, with right of way, and and you rudely cut in front of me like that, instead of waiting your turn, I will run you off the road.