This mentality has permeated dueling since its inception; it does more harm than good.
Yellow has traditionally been a very solid style throughout the entirety of MB2's lifespan - I'd say the best style overall, as I can't recall when it was ever less than A-tier. Yellow is a great style to learn if you're new to the game as it has a great mixture of offense and defense, but there is no 'de facto' way to play a game mode that allows for a high degree of individuality and creativity.
There are 7 styles available for people to use (back in the day there were 3), and irrespective of how certain styles are doing, duelists (particularly those new to the game) should not be discouraged from using the style of their choice or deterred from trying different things out of fear of being labelled a 'random shit player'.
Note: this isn't to say that the current system is perfect (certain styles are definitely outliers).