Someone who really hates you can try to make trouble using the statements, but it's mostly trying to get the IRS to pull your charitable status. But the IRS is also aware there are a lot of dumb assholes who try to make trouble. Depends if someone serious can make it stick.
The main issue is if the IRS thinks it's a scam in charitable clothing and not a genuine charity. But I think that our friends are very sincere in their charitable purposes and generally incompetent, and the IRS is extremely used to that combination.
yeah. it's important to remember that in general, charities are fucking incompetent and suing them for being useless MFs tends to do nothing useful.