I don't know about a cheap mechanic. I think people are just trying to style on you TBH. Don't take it personal though, I think everyone goes for an AF if they have the chance (Lord knows I do). To answer your question, most are blockable/avoidable, and most have to be combo'ed in to, with certain exceptions (Arakune, Tager, Nu, and Bang come to mind, as they are either terrible or command grabs).