Summary: Today is not just like 1987. In 1987, the stock market crashed.
In 2013, the S&P 500 was just like 1987.
In 2014, the stock market was just like 1987.
In 2016, the stock market was just like 1987.
Today, the stock market is just like 1987.
Today is not just like 1987.
Pointing out that today is not like 1987 isn't a signal that "everyone is bullish." It's a statement that today is, objectively, not like 1987. Neither were 2013, 2014 or 2016.
It's also not just like 1929.