Was I wrong to say this to my kids teacher?

I have twin boys. Both in 7th grade. They don't have any classes together and have different English teachers. I had a parent teacher conference with one of my boys teachers and she's an older woman. She asked how I liked my other son's English teacher. That one is a younger. Like very young. I would be surprised if she was older than 24. I said she's great. This teacher says she hates her and starts gossiping about her and about how she tries to act young to fit in with the kids and how she uses slang to fit in. She does use slang. I meant with the younger teacher once because my son who has her got in trouble because some girl was bullying his friend for being gay in her class and he said to her what was said to Margery Taylor Green. Told her she had a bleach blonde bad built butch body. And the teacher told me "Listen. I get why he said it. But he can't say that. He will have to apologize. But he ate with that!" So I've heard her use slang. But she's also very young. Anyway the teacher was just talking about how there needs to be an age cap for teaching secondary and all these young teachers are coming in with their slang and she goes on just talking crap about her and I said "Are we here to talk about my kid or for you to hate." She got very upset that I said that but if you don't like her okay but why talk crap about another teacher to me