You have to get a new circle of friends.
Yes, a new circle of friends is what is required, but that does not mean dumping the old ones. You can have many friends with many interests, you know, and obviously your current group find your talk about investing either boring or uninteresting. They may feel you are bragging, or think they are helping you by telling you not to do it, or it could just be tall poppy syndrome.
I have a small group of friends that I talk about investing with. That is because they are fellow investors. Several other people know I have property, but I don't speak about it unless asked. Although I rarely speak about investing when sociallising it is amazing how many people actually do know and will ask from time to time, but they never really want details. It could just be a quick comment like "Do you still have XYZ house?" or "Aren't you scared someone will trash your house?" They don't want in depth answers either. A quick yes or no is usually enough and the topic is over.
This is one of the reasons this site is so popular. Many investors find that this is the only place you can really talk about property.