I've settled into a pattern of
1. asking a question on maths.stackexchange
2. getting some useful replies maybe
3. getting lots of "don't post this question" replies - almost all of which are baseless
4. deleting the question once I have enough useful replies
The root cause of this particular phenomenon is the over enthusiastic "senior members" who police a site that wants to be useful as an AI dataset*, and not a site that is useful for users - the two are not the same.
The only way to post a question that doesn't receive flames is to be an expert on the topic already and also the history of similar question going back 10 years.
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* or some other objective that is not about normal users who on the site precisely because they are not experts who know the answer and context already