If he has often shown generosity to others, whereas you tend to be a bit tightfisted, why not note the joy that comes from giving to the elderly, the sick, or the needy?
مِثْلَمَا تَخْنُقُ ٱلْأَعْشَابُ ٱلضَّارَّةُ ٱلْأَزْهَارَ فِي ٱلْحَدِيقَةِ ،‏ تُعَكِّرُ ٱلْمَشَاعِرُ ٱلسَّلْبِيَّةُ سَلَامَ ٱلْجَمَاعَةِ .‏