The following things will DAMAGE my respect for a man, but... nobody's perfect, and I'll try my best to understand why they did what they did:
• Defecting over to the side of "what's popular", when there's a conflict between what's popular and what's right
• Failing to hold his positions and convictions, in the face of opposition
• Not having an honest understanding of his strengths and weaknesses -- either personal or professional -- or, worse, denying his weaknesses, when there's been plenty of opportunity to learn
• Living a static life, refusing to work on bettering himself (if I ever "nag" -- which I really, really pretty much don't -- then this is why)
• Failing to distinguish between real friends and fake friends
• Not being there for his friends in a time of real need
• Refusing to identify toxic relationships and negative influences, and/or to distance himself from them -- even if it's painful to do so
• Giving in to friends/family who need "tough love" for their own good
• Looking to knock others down, rather than looking to bring others up when they're down
• Letting stupid rivalries fester and escalate for trivial reasons, instead of settling differences like a gentleman
• (if in a position of leadership) Not deferring to the advice of someone who is clearly more knowledgeable and/or experienced, because of ego
• Losing control
• Joking about something that's clearly too serious for joking
The following things will DESTROY my respect for someone... after which I'm just DONE.
That person becomes a non-person -- I just can't deal with them at all anymore:
• Lying, AT ALL, EVER
... with the sole exception of soothing the mind of a dying person
• Breaking a promise, AT ALL, EVER
If you don't have yr word, you are nothing. You are literally as good as dead.
• Mistreating or abusing children, animals, elderly, sick, or injured people
• Disrespecting service workers (waiters, salon staff, drivers, etc)
These 4 are one-and-done. No second chances with these.
A lot of people are surprised at that last item on my "one-and-done" list, but, yep. I mean it. Decent people just DO NOT do that.
I have EXACTLY the same standards for close friendships, too, whether women or men.