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Grass types have their uses as much as the next dragon or whathave you, it's just if you think you can use them on the same way as dragons, you're deluding yourself. Most dragons can win through sheer brute force. Grass type is not as strong, sure, so you have to use it in other ways.
Usually by giving status effects to your opponent or boosting your own before going at it with what you have; grass types usually have a kinda crappy coverage but it's possible to make it work. Leech Seed, Spore/Sleep Powder/Toxic, Leaf Blade, etc, pick a lot of shit and it can be used well. Dragons usually can win by spamming a single move or using The Button.
And while that's okay with some people, others like to play differently. Or they just like the look of grass types more than most dragons.
Tl;dr version:
Nice opnion there bro, nobody cares
Also
7/10 made me reply and type out all this shit even after figuring out the bait