Kale and other leafy greens greatly benefit from a nice massage before you mix them in a salad. But if kale's bitter flavour bothers your taste buds, you might want to change the usual order of operations.
Instead of rinsing your leafy greens before massaging and chopping, you should rinse them after. Why? The massaging helps soften up kale, but that and the cutting release a bunch of bitter compounds that don't taste too great. But if you save the rinsing for later, you can wash away most of the bitter stuff that gets released. Now you won't have to overdress your kale salad and undo any of the health benefits.
Sorry to say it but your salads are probably boring but you can't blame the humble old meal itself, it's most definitely you. But that's okay, life is all about learning and that's why a Twitter user dished up some helpful tips to turn your dreary salads into something tasty, or at least edible.