Hi, welcome to the English-speaking world! Sometimes we say things in a self-deprecating way as a sort of social lubricant. Those times are NOT an invitation

Hi, welcome to the English-speaking world! Sometimes we say things in a self-deprecating way as a sort of social lubricant. Those times are NOT an invitation to insult somebody. Plus, the way you said it makes the rest of us think you prefer the "brutal" part of "brutal honesty" over the "honesty" part... You are welcome to interact with other humans that way, but you may find them to be less receptive to your ideas. In other words, "manners are free."