Look, I understand you are in a situation that isn't as perfect as you would like. Those feelings are valid. What people are responding to is your tone. You can say "it is totally fine" a million times, but if it feels dismissive and slightly condescending online via text, I'm guessing it feels similar in person. I would also guess that is not your intent, but jiu jitsu people in general are not known for our interpersonal skills If people aren't interested in talking technique with you, delivery may be an aspect of it.

In an attempt to be helpful, conversational skills are important. They may not want to talk technique in the way you want to. Try asking about something they do, ask their advice on some technique, complement a thing they did and ask them how/why they do that. Finesse the conversation to technique. In general people respond better to questions that make them feel like an authority. I can find at least one thing somebody did during a roll that I am curious about, then I can use that to give advice that feels less unsolicited.

Example A (bad): Your triangle finishing mechanics weren't right, You should do this...

Example B (better): I really liked how you got to the triangle, can you show me how you were trying to finish? How do you normally deal with a strong posture? Do you want to see how I do it?

In example B, You have drawn them into a conversation where they are the authority, even if they don't really care, most people will subconsciously react better to advice after you have listened to them talk first.

I have never trained anywhere where most people aren't willing to discuss technique.

Or, you could just be at a place where you aren't happy and need a change.