Ah, my DH's brother. What a peach of a guy he is.
About 4 years ago, DH and I weren't married yet but were sharing a home. We invited his family (parents and BIL) to spend Christmas with us, along with my mom. It was a tight squeeze but our house at the time was big enough that everyone had a bed.
Our dining room chairs were in pretty bad shape, so we went to IKEA and bought some replacements. These weren't particularly fabulous or expensive chairs, but sturdy enough. BIL is a very big man - 400+ lbs. I knew there was a good chance the chairs he sat in would be damaged, and that was ok - that's why they were sturdy-but-inexpensive. He didn't just sit in his chair, he wiggled, tipped back, etc...and after a few days, when all the joints were loosened, complained that we had given him the broken chair. I didn't mind that the chair was damaged, but don't complain about it as though we deliberately gave you substandard seating.
Christmas dinner...my mom and I are diabetic, MIL is pre-diabetic, and everyone except FIL is pretty overweight. So in addition to the regular desserts (various pies from a local bakery), I had one sugar free cherry pie. If you've ever had one, they are usually a little tart, but actually more cherry-tasting than anything. They don't taste like a Hostess fruit pie, for sure, but they are quite tasty and not what I would consider 'out there' or hard to eat, and I'm a pretty non-adventurous eater.
I made a production out of letting people know that the pie was sugar free. BIL took a big piece, then a big bite, then SPAT the mouthful onto his plate. 'Oh, that's disgusting...that's so gross...ewwww, it's so sour....ewwwww'. He was 28 at the time.
BIL was looking at some photo albums. MIL had dug through some boxes and given me snapshots from DH's youth. One of them I had taken to Walgreen's and had enlarged to 8x10 and framed. BIL saw that and was quite jealous. So he went through the photo albums and took about 7 snapshots - just took them, didn't ask. I asked him to be sure to get them back to me if he wanted to make copies...about 6 months later, I got poor quality scans of them in my email.
We see a lot more of BIL these days due to various events, but I'm also a lot more direct with him.