Yeah, that's a bummer. I try to provide gentle, private feedback to the unsolicited-tip dogpiles.
My hope is that if, culturally, we got to this point where providing alt-text is part of the Mastodon identity (which is rad af), we should be able to do the same thing for the new user welcome and not dogpile folks for perceived CW transgressions, etc.
@Haste I still sometimes get folks aggressively approaching me for providing alt text when I forget (Ivory doesn't allow adding alt-text from the share widget on iOS), when instead of getting angry at me they could just reply with the alt text and then I'm like "oh shit, my bad" and add it.