This is very cultural. I believe, from your question, you are from a heavily judeo-Christian are, likely more heavily Christian.
The Torah mentions that you shouldn’t cook a kid (baby goat) in it’s mother’s milk. This has been interpreted to separate meat and milk, culturally as Jews, for thousands of years. Christianity came along and decided separating them wasn’t a big deal anymore, but kept in place the definition of lactating animals being meat. Chickens are a new world bird, and since most land animals we eat lactate then it was an easy choice to determine chicken as being meat. There are however a small group of people who do not count chickens as meat.
If you meet a Jew who claims chicken is meat (most), ask them about lactating chickens.
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