He treats everyone like garbage and tells each of them, if they complain, that they are too sensitive and if they can't handle it they are all [expletives].

But that's a garbage metric for REI. 

Google Sheets is a great tool for multiple people to track expenses but as they say "garbage in garbage out" so see where the breakdown is and shore that up. 

Is cleaning up garbage, scrubbing toilets, fixing broken sinks, carpentry or any of those the highest & best use of your time? 

If there were any decent wholesalers in NJ, I would consider them.But let's stop the rhetoric. 99 percent of wholesalers are absolute garbage.

Garbage in garbage out as they say when evaluating things.

My parents got screwed with the 401K and stock market and it's my mission to get everyone out of that "garbage!"

We're doing a ton in Detroit yet and it's largely using our experience and market knowledge to sift through a LOT of garbage.

For example:General-Filters (furnace, air conditioning, oven exhaust, refrigerator, and water)-Stove burner when the “eye” needs simple replacement-Batteries and remotes that service the premises-Fan and light pull strings-Smoke and carbon alarms testing and batteries-Ensuring appliances are properly plugged in, hooked up, and used-Removing dirt, debris, and lint in and from connection pipes (e.g. clothes dryer)-Tighten loose screws on all home functions (e.g. doors, hinges, handles, socket -Balancing off-balance appliances-Cable, internet, and phone jacks-Fire extinguishers-Systems operation (e.g. security, irrigation, HVAC)HVAC-Monthly A/C filter and drain line maintenance Electrical-Reset “tripped” GFI breakers-Light bulbs (throughout and at the end of the tenancy)-Blown fuses-Reset breakers in the outside and inside breaker boxes-Socket and plug outlet coversPlumbing-Unclog drains or toilets-Caulking around tubs and showers as needed-Gas pilot lighting-Leaky faucets and shower heads-Toilet flappers, handles, seats and seat lids, tank lid, and flush kit-Sink and tub stoppers-If septic tank present, use RID-X as directed on consumer box-Proper cleaning of garbage disposal-Loose faucets and sprayer heads and hoses-Faucet filters (i.e. aerator)-Open exterior plumbing clean out when necessary (e.g. sewage backup)Exterior-Routine lawn (and pool) maintenance-Adjusting sprinkler heads as necessary-On the last month of tenancy, tenant must perform required lawn maintenance no sooner than 2 days prior to vacate dateThere’s a lot to consider as a landlord.

Everything you said above makes complete sense and to think that an insurance company can deny this claim over a smoke detector is garbage.