Yes they can be questioned, just do the research, write a paper citing your falsifiable evidence, and submit it for peer-review.
“While biologists do draw a distinction between micro-evolution and macro-evolution it really is a distinction without much difference. Or to put it another way, the distinction is a rather artificial one imposed by biologists. The simple answer is that the process at work in macro-evolution is precisely the same one at work in micro-evolution. So to say I believe micro-evolution, but not macro-evolution may sound erudite to the uneducated, but to those who are familiar with the topic you sound like a boob. It is like saying I believe in molecules, but not in atoms, electrons, protons and neutrons.” ~ Steve Verdon
“Microevolution is a term - when used by creationists - that is the evolutionary equivalent of the belief that the mechanism you use to walk from your bedroom to the kitchen is insufficient to get you from New York to Los Angeles.” ~ Unknown
Excellent analogy placemarker
"Microevolution is a term - when used by evolutionists - that is the evolutionary equivalent of the belief that the mechanism you use to increase your vertical leap is sufficient to allow you to jump to the Moon." - GourmetDan