You find it strange, because you have no similar experience.
Nobody plagiarizes you, copies your ideas and words, or latches onto information you provided and attempts to pass it off as their own - because you are not very insightful, original, or erudite.
You yourself have plagiarized my lexicon, style, and syntax.
I am allowed to call out dunces who plagiarize me and try to pass off my writing, observations, and insights as their own. This is likely an experience you will never have.
I try to keep my mouth shut on topics I am ignorant of or only have superficial knowledge of. There is zero need for me to apologize for, regret, minimize, or downplay my education and knowledge about certain topics.