Is there any difference in meaning between "say about" and "talk about"?
Answer from a Native speaker
Yes, there is a difference! "Say about" means that you're implying a certain quality or characteristic about something or someone, usually negative, sometimes positive. Whereas "talk about" means to chat about a topic or people in general, rather than a certain quality or characteristic. Ex: We were just talking about the camping trip. Ex: She had a lot to say about me to my friends after our fight. => negative qualities to share Ex: We didn't have much to talk about after our fight. => general chatting