I have become inured to people's sarcasm and abusive words more so than when I was younger.
この場合、次のような言い方ができますよ。
ーI have become inured to people's sarcasm and abusive words more so than when I was younger.
「若い頃より人々の嫌味や暴言に慣れた」
to become inured to ... で「…に慣れる」
sarcasm「嫌味」
abusive words「暴言」
ご参考まで！
カナダ 
