Exactly, the market is definitely overenthusiastic which we can call a bubble. So we keep on hearing all those claiming it is a bubble in the sense that it will

Exactly, the market is definitely overenthusiastic which we can call a bubble. So we keep on hearing all those claiming it is a bubble in the sense that it will imminently "pop" because people will always want to say "I predicted the bubble will pop". So they will wake up every few months (when the market peaks yet again) and shout "bubble, bubble" so that just in case it happens now they can be the foresighted ones. The amount of times we've heard "bubble" over past few years, even while/if true, in of itself keeps people from taking it seriously.