IMO, "friends" who view you talking about your horse as bragging, are simply jealous, petty, and do not know how to be happy for anyone except themselves. They are not really your friends. There is an old saying that if you can count five true friends by the time you die, you are lucky indeed. I have two true friends. The rest are just acquaintances that I enjoy being around. That said, I would never count on those acquaintances to ever do me any favors especially in a pinch. My two true friends would bend over backwards to help me out, no matter what. Those are the friends whose opinions should matter to you. The rest of your "friends" will come and go through out your life. Don't stress about their pettiness.
I have a lot of acquaintances, I have few true friends. Some of my acquaintances ask about the horses as a way to make conversation or I might bring them up when we've run out of small talk but I can tell they're not really interested. It's not personal, it just isn't anything they can relate to.
My true friends though, they ask questions or I talk about the horses and their eyes light up like we're all little kids again. They're happy for me and enjoy talking about something interesting going on in my life.
While I've never had super jealous friends I get snide remarks sometimes. Most joking around when I get a new saddle(I had to buy a few, odd shaped horse). I have a trust fund that covers vet, board, trailer and the big stuff. I'm not super loaded but I never have to worry about my horse not getting fed.
That being said it's the non horse people that think I'm a grand prix dressage queen that has $1500 board and a 50,000 racehorse when I bring up my horse. While I was at school in California people were literally amazed when I told them I don't ever feed/water/muck stalls. My teacher kept asking if someone was taking care of my horse while I was gone. I'm like duh, it's the same guy that feeds her everyday. Haha silly non horse people and their stereotypes.