This is their mehalach. The Litvakes were always the great Talmidei Chachamim – no-nonsense ppl (ex: The Vilnar Gaon).
Chassidus OTOH, was created for the pashut ppl who weren’t too great in Torah. The Baal Shem Tov started this movement to get the Hamon Am to be frum in spite of their ignorance. In order to win them over, they did it in a simchadike fashion. (There were great chassidish tzaddikim too, of course, but, this is the reason why the movement started.) Therefore, the chassidim are to this day “varemdik” and “lebedig”.