Off the top of my head and keeping in mind that we all have standards that may not be strictly legal would you reject some of these :Neck and facial tattoos, single guys, recently separated women, single mothers, welfare, restaurant workers, nationalities know to cook offensive smelling food, smokers, low income immigrants, bikers, tattoo artists, recreational drug users, prostitutes. others.Or based on human rights laws etc. is everyone welcome as long as they pass basic screening standards. 

Minimum credit score, minimum income, no evictions, no felonies in past 5 years, no sex offenses, 

Not the other way around.No offense those who are legal council have most problem finding a landlord.

If you then tell about his offense, it's a slippery slope-- will you be notifying neighbors of others bad behaviors like  misdemeanors too?   

@Grant Mone  No offense, but you sound like you are all over the place so a mentor probably couldn't help much yet.  

Out of all the anti-landlord measures that they were considering, this is the least offensive one.

If you don’t want to go that route, it’s their responsibility to get it to you in time.But, for your specific incident, I would respond with a ‘Please don’t take offense.

I take great offense to the idea that protecting myself *from* zillow is somehow "unethical".

No offense to you personally, but there are so many people out there trying to do this that fail or never get off the toilet, its not even funny.

I am also quick to respond to tenants while in their lease so I am not sure why you would take offense to something you or any other landlord would do, if it required.