From https://www.reddit.com/r/DebateEvolution/comments/1ap1ato/do_creationist_understand_what_a_transitional/
boulevardofdef
I still remember the first time I ever heard the creationist claim that no transitional fossils had ever been discovered -- it must have been 15 years ago, in a Ray Comfort YouTube video. I laughed out loud. I was like: "Oh, that's how you're going to play it? Nice."
Fifteen years later, it seems to be that the denial of transitional fossils is two things. First, it's goalpost moving. You can do it forever because evolution is gradual. There's no transitional fossil between Species A and Species B. Wrong, yes there is, here's Species C. Well, then, there's no transitional fossil between Species A and Species C. Wrong, yes there is. And then so on and so forth until you can't find a fossil anymore.
Second, they seem to think that evolution means sudden, huge leaps across biological clades, and that fossils should reflect that. Evolution claims that a pig and a gorilla have a common ancestor. So where's the transitional fossil that shows characteristics of both pigs and gorillas? An animal with a big ol' gorilla chest and a pig snout? This sounds absurd but that's 100 percent what they believe.