Yes, the bike he was on had nothing to do with it. It was simply that he felt the need to work hard to pass me at a light when it turned green, then slowed down considerably once he got in front of me in an area I could not safely pass. Road bike, folding bike, electric bike, running, whatever, this would annoy me.

Its basically the same as if a car was at a red light on a road with one lane going in that direction, and when the light turned green another car behind that went into the shoulder and floored it to get ahead of a the first car, then slowed down to half the speed limit once they got in front of that other car. Its just inconsiderate.

I have been in many similar situations where I got passed, by road bikes, commuters, etc. like this but it didn't bother me as they kept up a reasonable pass, not forcing me to ride coast or ride my brakes behind them. Even this morning I got passed by mountain bike commuter who was peddling hard (going over 20 mph) but he kept up the pace so it didn't bother me.

I have found most other bikers on my commute to be more polite then the guy last week and not pass at a light if they expect they will be slower then you. I have no problem letting someone pass me (and trying to make it easier/safer) if they are faster then I am.