Got my 3rd write-up at work for saying what I actually thought in a meeting

So I work at a call center in Dayton and we had a team meeting where the manager asked for honest feedback about a new script we have to read. I said the script sounds fake and customers can tell, and I gave a real example from a call where a lady in Cleveland hung up on me mid sentence. That was write-up number 3 in about 8 months, all for stuff I said in meetings where they asked for my input. The thing is nobody tells you the honest feedback request is just a box they have to check, and saying the real thing gets you in trouble. Now I just nod and say the script is great. How do you all handle it when a boss asks for honesty but you know they don't want it?