I'm not the person you're replying to but I have a fun answer for how I did it before I moved to password managers.
I used to have just a single password, normal-ish password. Reasonable length, some numbers in there, random caps. But in order for me to have unique passwords on every site without losing track of all the passwords, I added the first and last letter of the name of the service at a specific point inside the password. My password was cryptic enough that if you would see it you wouldn't immediately notice it. But for me it meant I had a single strong password that was easy to remember and unique for every service.
I'm still kind of proud of that one, even though I don't use that method anymore.
Might I point out the reason why people might react so offended by it? You have your opinions. And that is fine. Nobody can tell you your opinions are invalid. But if you look back to your message, your opinions are stated as hard facts:
I understand what you mean with this. But it kind of reads similar to someone saying something like "All Americans are dumb". And then when everyone gets offended by it they be like "It's just my opinion, why is everyone angry at me?". And of course people get angry, You get all the responses from people who have an American friend, and THAT person isn't dumb! So of course your facts are invalid!
Anyway. Not a dig at you in any way. Thought I'd just let you know how it reads.