"Baseless paranoia"? Ask any black person you know if they think this is baseless paranoia.
This still doesn't make his reaction justified.
Eh, I can only speak anecdotally but almost all white people (who aren't active drug dealers) that I know haven't actually had bad experiences, modulo "the TSA at the airport patted me down!".
The single time that I've had any sort of negative interaction was when crossing the Canadian border and it was directly because my friend in the car had brown skin.
Anecdotal evidence is generally frowned upon when discussing statistics or topics in general terms.
But that's exactly what this blog post does. It's like this is actually propaganda which was created to paint the author as paranoid.
He doesn't tell any real reasons for being afraid, he doesn't seem reasonable and rational at all. He comes to the encounter with preconceived notions and doesn't even try to doubt.
Police brutality and racism are awful issues, and posts like that do real harm because they paint them as paranoid delusions.
This is the whole point, don't you understand?
Consider that your desire to see each encounter as a blank slate, disconnected to each other, is your privilege.
If you're black and encountering with the police, your encounter is full of decades and centuries of "preconceived notions" -- of abuses of power.