Rashi [Bava Metzia 58b ד"ה דדש ביה] says that one may not call his friend by a derogatory nickname even if the guy is used to it and takes no offense. Why would it be אסור if he doesn't care???
Contribute and be a partner in spreading Torah to the masses. Money comes and goes but the merit of giving is eternal. Keep the light burning. Without you it might extinguish G-d forbid.
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