"You need five years of Java experience, with at least two years being Java 10, but if not at least seven years of C++17"

I went to meet a client with our CTO. In the meeting we discuss the implementation of SAML SSO. Their SSO guys asked whether they need to build 2 trusts for our application because we have 2 modules that use SSO. Both the CTO and I were not sure because we did not have any prior experience of integrating SAML SSO. To act professional, we couldn't say we were not sure. So the CTO said we needed two trusts. I immediately added "We may only need one. Let us do a bit of investigation and confirm."
After the meeting I did the investigation and found out we really only needed one. So I sent out an email to tell the client, cc the CTO. 1 minute later I got the email from the CTO "why tell them one when I said two?". When it's an immediate response with only 1 line, I know I'm in trouble. So I called him and was ready to explain to him. I couldn't. Later I found out the time I was calling him, he was talking about this with the CEO.
I thought maybe I can explain to him when he's available. The next morning as I came to work, the CEO asked me to come to his office. He closed the door, and told me the first line the CTO told him the day before was "I want him (me) fired." I was so shocked. Having been working with the CTO for quite a while, I was surprised he said that without even communicating with me. Did I do something that wrong that you don't even bother to tell me what's wrong? I was not fired because the CEO at least asked what happened. He also understood I was actually making a better technical decision. But well, guess I shouldn't be making a decision when I had no power to. And even I believed the client heard my "let me investigate first" comment, the CTO didn't. I still got an unofficial warning. For that whole day because of the stress, I don't remember getting anything done.
Fuck that acting like profession and smart when you are not. I'd go down the path of becoming professional and smart instead. And fuck metting with clients. I'm a dev don't fucking dare to talk to me and get me fired. If you wanna talk, talk to the big guys who don't make us look bad like I did.
If you ask me today I still believe I haven't done anything wrong there. So fuck everything.