posting pictures sideways

I have noticed that some members are uploading pictures sideways. I think this should be considered rude or a violation of rules. Is it such a problem to make sure all your pictures are up? If I see sideways uploaded picture, I turn my phone or tablet, and it automatically rotates it to sideways position again. Unless I download and save and correct the rotation, it can not be properly viewed. And I do not want to download necessarily.
So, now you know, all of you posting sideways pictures, you go straight to "ignore" list.