@AppleCiderVinegar
Sounds like your brother wants to lend this stuff out, and then ask for it back, so he can complain, and say it's broken/faulty now, and insist you buy said item(s) new for him.
The way he is blathering on about you being 'ungrateful' is very telling, and suggests (to me) that he is after someone to buy new for him.
I am guessing golf clubs. fishing tackle maybe???
Whatever, tell him to stuff off. I have had this before. A 'friend' of DH's insisted on lending us his camcorder (back in the late 1990's) and we didn't want to as it was £450 worth of kit at the time (about £800 in today's money,) even though it was 2 years old or thereabouts...
But he insisted! So DH reluctantly took it from him, and we used it on our holiday (to Paris,) took some footage, and gave to back to him.
Surprise surprise... The day after DH gave it back, his 'friend' rang him and said it was broke, even though it was FINE when we gave it back. (Over 20 years ago now, so I can't remember HOW it was broke; bust lense or something.) He said we 'probably didn't mean to break it' and that he was happy to accept half towards anew camcorder... (About £225 - or £400 in today's money!)
Long story short, it caused a big argument as DH refused to cough up. He said we never asked to borrow it and we never broke it.
We all fell out after that, but it turned out he was not much of a friend anyway! (Not doing THAT to us!) Even to this day, we both swear that he lent it us, just so he could break it, then blame someone else for it being broken, and get someone to cough up towards a new one!