Jabs do sour relationships with people who aren't open to being spoken to in that way. Your previous comment about people becoming "too sensitive" makes it sound like some of your relationships may have soured in that way (speculation, I don't know your life; if you deny it, I'll believe you). Being tactful means feeling out the vibe, jabbing at people who appreciate it, and taking another tact with people who don't.

The world isn't dualistic. There are more kinds of people and more ways of interacting than are dreamt of in your philosophy. If there are people you don't get along with and don't want to be friends with, that's fine, live your best life. It's the same way for me, and GP said the same as well. But understand that's a choice you've made because it's right for you, not something objective or universal, and try not to judge others for making a different choice.