I like black fences, they look spectacular as a back drop for many plants. But you'll be relieved to hear that I have stone walls, so no chance of indulging in that trend. Have indulged in raised beds though, also have a big trampoline and a sort of palm tree - they are fairly normal here (seaside).
My dislikes aren't really trends though.
Excessively manicured gardens, which belong to same type of people who rant about wild flowers and no mow on public land. Their gardens are very alternate red and white geraniums in rows. Stripy perfect lawns which obviously aren't achieved without weed killer. Glyphosphate being another of my huge dislikes.
Fake grass, though I'm having a bit of a wibble there. We have a mossy concrete back yard that gets no sun, it looks awful. Fake grass couldn't look any worse.