You're someone making choices about whether others are dong things "correctly," which shows that you think way more than most motorists.
Stereotyping to save time:
I'm late to work/pick up kids
Hop in Prius/F150/BMW
Cyclist in right side of lane on front of me
Cars coming other way
Can't pass cyclist yet
Don't want to wait 4 seconds to pass
Honk at cyclist in frustration
Honk/Buzz as driving by and flip off
Happens all the time. The impatient motorist doesn't know you've been stopping, waving and smiling for the last 35 miles of your ride.