It's pedantic to most, I'm sure. Just FYI, though, antisocial is to be opposed to society - like Timothy McVeigh. Asocial is probably what you're looking for.
You're not just being pedantic, you're also wrong [0][1][2][3]. Their usage is 100% standard and is encoded in every dictionary I can find, and etymonline lists it as the original definition dating back to 1797 [4], with "hostile to social order or norms" first recorded a few years later.
To be extra pedantic, I believe you meant Ted Kaczynski.
Timothy McVeigh was trying to make the US government pay for specific things it did to "his people"; Ted Kaczynski was lashing out at the industrialised world after living in isolation in his cabin in the woods.
[0] https://www.dictionary.com/browse/antisocial
[1] https://www.merriam-webster.com/dictionary/antisocial
[2] https://dictionary.cambridge.org/dictionary/english/antisoci...
[3] https://www.collinsdictionary.com/us/dictionary/english/anti...
[4] https://www.etymonline.com/word/antisocial