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instead of hounding people for not providing image descriptions, reply to their post with a transcript, if you have the time and desire to

it indirectly encourages them to put a description on future posts and it actually helps people instead of just being more negative energy

and if the person didn't include an image description because /they/ didn't have the energy to, instead of guilting them for it, you are, again, helping, rather than just contributing more negativity