NSFW time! I am continually floored by the sheer lack of nuance that these folks have. Here, my guy is conflating three separate concepts:

• ACAB: Police culture has the "thin blue line," the concept that cohesive policing is the main force preventing modern society from collapsing into lawlessness and chaos. As a result, police cannot be trusted to respect non-police. Our friend here might benefit from knowing that ALAB as well, due to the oath that lawyers profess upon admission to the bar.
• Defund the police: In the USA, many cities have steadily increased spending on police over the past century or so. This has not correlated with a drop in crime (and it can't cause a drop in crime, since police respond to crime but don't prevent it!) and so there is a call to reverse spending increases.
• Militarization: Our friend doesn't explicitly say it, but police have become more violent over the century as well, equipping themselves with ever-more-dangerous tools. This also isn't correlated with a drop in crime, and some of those tools are illegal to use outside of war, leading to a call for partial disarmament.

Don't get me wrong; some law enforcement is necessary in a lawful society. Try having a trial court without a bailiff, for example. But it sounds like our dude is a recovering ancap, and he just can't see shades of grey.