rubber duck it.
pretend you have a friend. they're busy taking a huge shit and can't come look at a screen. they want to know what the image is, but they can't see it -- they're busy. "what's the picture?"
"it's just a collection of soda cans on my desk i haven't cleaned up yet"
"a funny meme featuring some guy staring at a toilet saying 'is it hot in here? i feel flushed'"
"a screenshot of some clown on twitter saying 'wow nice mugshot donald did you shit your pants while they were taking it?'"
nobody is going to come along and grade your alt text with a red pen. just make a reasonable effort.
"you don't put alt text on all of your images": yes, i'm bad about it. the interface for doing it isn't great (though better than it was). it's something to work on.
