A possible piece of evidence – a 1928 letter, a pretty late period. Maybe you can trace this and verify whether the letter and the translation I am quoting below are genuine:
from Rav Aharon HaKohen .. Author of the book ‘Avodat HaKorbanot’ Son in law of the Gaon Israel Meir HaKohen Shlit”a author of the book Chafetz Chaim and Mishna Brura.
I know that my master and teacher, the Chafetz Chaim Shlit”a – who honors and is very fond of the honorable Gaon Avraham Yitzchak HaKohen Shlit”a and whose heart was greatly sickened when he heard of the persecutions against [the Rav] – did not come out with public rebuke regarding this, saying that silence regarding such matters and the reduction of their publicity is [the proper way] to repair them – [that is] to lessen and reduce their value. (nevertheless, no one dares utter words of disparagement against our teacher Rav Avaraham Yitzchak HaKohen Shlit”a in front of our master[, the Chafetz Chaim,] and he would turn his eyes with contempt from any posters
However, when I recently saw that a periodical that has appeared – which arrogantly dares to call itself “meeting place of the sages” – wrote horrible, cursed, and blasphemous words against our teacher Rav Avaraham Yitzchak HaKohen Shlit”a – [words which] are forbidden to even put in print – I find it a holy obligation in my soul not to be silent (as is explicit in the Rambam הלכות ת”ת פ”ו הל’ יא-יב). [This is because] someone who disparages a Torah scholar has no portion in the world to come, and is in the category of one who “despises the Word of Hashem” (כי דבר ה’ בזה), and we are obligated to banish him.