Yes, you should mean it when you say it. In part because otherwise your mind isn’t letting it go. If you genuinely wish somebody good luck when you walk away, you’re subconsciously releasing whatever attachment you have to them.
I often do this with people I really dislike. I wish them all the best of luck and hope they’ll find whatever happiness and fulfillment they seek in life. But stay out of mine. Live and let live.
Also very much correct. Our brain works contextually, it uses the first impression to place everything it receives as input into a little box describing what it is and connects that box to related boxes. This helps us consciously cope with all the information that comes at us at all times and speeds up subconscious processing.
It has a lot of downsides as well of course. This process also uses information that comes in from senses other than our 5 primary ones. It also notices all non-verbal communication. It notices everything and then stores it away in a box without asking you if you actually want to.
This is why we have to tell it what we actually wish to be informed about consciously. And it will start showing us those things that have always been there but which we’ve never noticed before. Hello, manifestation!
That said, Budewr did not say thou shalt not judge, he said it’s not our job to judge. And that in most cases is true.
Just because our first impression tells us that we’re meeting a person we don’t want in our lives, we don’t have to accept that. We still have the capability to consciously act against that instinct.
It is our ability to act against our primal response which allowed us to stop living in barbarian tribes and clubbing people over the head and move into this thing we call civilized behavior. Unfortunately most people fail to realize that under that “civilized” facade still lie our primal instincts. And we need to acknowledge and appease those in order to reach our full potential.
I think one of the big qualities of an alpha male is his ability to do the above. To be in touch with his primal side and let it come out to play in a controlled fashion. It makes him radiate that attractively dominant and dangerous vibe and allows them to listen more carefully to those invisible factors that the brain uses to put people in boxes. It makes them more intuitive.
Boy, the amount of amazing relationships I’ve missed out on because either I or the other person failed to see the signals we were sending each other…
Umm… Saint, can I get a raise? 
Actually, I know very well it’s my personal beliefs getting in the way here.
But as stated above, I will see the bad parts while others will see the good parts. That’s just the boxes I’ve trained myself to be alerted to. I was devastated last time, so my mind has become extra keen on recognizing the signs happening here.
Other people will only notice the good things.
Keep in mind I followed it up with:
What’s that part of the Serenity Prayer again? Give me the strength to accept the things I cannot change?
I got that down quite well. Is it within my sphere of influence? No, then I let it go, I got enough to deal with in my life.
Doesn’t mean I won’t get on my soapbox every so often. But only when my SubClub hat is off. I soapbox incognito. 
Whatever the case, that particular post was indeed highly subjective and will be for all of us, which is why I didn’t engage remarkable when he replied to it. Everybody will see those events in a different context because… full circle… that’s how our brain works.