I tried giving him advice on how to confront his mother. He gets mad at me. How to react?

So my bf shared some feelings about how he would like to confront his mother about how he dislikes how she acts around him and the way she speaks to him. I told him I thought it was a good idea since it is bothering him a lot, and she doesn't know how he feels. He said he wanted to just confront her directly. I mentioned it might be a good idea to plan out how he wants to confront her, instead of just aggressively attack her, if he wanted a meaningful conversation. I said he could maybe write down some of his thoughts.

This really set him off, and he told me he wasn't gonna sit down and write a fucking poem, he was gonna tell her the way he wanted to tell her, and not sit around rehearsing for a speech.

How am I to react to this? I said to him that I didn't mean it like that, and I agreed that maybe my suggestions were a bit overcomplicated.

I felt really hurt to be honest. I felt like despite my effort to try and understand him and come with friendly suggestions, he just thought they were completely idiotic-sounding. I feel like I kind of ruined my chance to have a good conversation with him by overcomplicating everything.

He shut me off and told me he had to work now.

Should I just never try to talk too much with him about things like this again? I want to let him know I understand his feelings, but I'm thinking I shouldn't suggest how he could handle things?