Another point I would make about info dumps is that you should make the distinction between 'infodumps' (bad) and exposition (good if done well, if done bad they become infodumps).
^This.
Infodumps, in my opinion, are always bad. It's when the author halts the narrative for a moment to explain, almost like forcing you to read a footnote, which jumps the reader out of the story. Exposition skillfully handled does not do this, and therefore is not an infodump.
I try not to do it at all costs, and if a reader tells me something comes across as an infodump, i cut it, or find another way to get the information across.