You are doing it the right way - i personally flag only people with hate speech and radical political things - i could do more but it is too much already - i hear you on time invest to answer comments - i was guilty often but usually or too often most comments are for the bin - especially most of the ones commenting within 20 seconds after I posted - in early days i tried to educate them and explaining that actually reading and proper engaging might be better long-termed but I felt it did not make sense a lot - i tend to ignore bullshit comments - even I know we all should do this together to help the platform.