Many people find it difficult to accept who they are and the bad habits that they have, accepting a habit is the first step that will determine if any help offered to you will work. As a gambler, will you find it offensive if you are referred to as a gambling addict? will you easily accept it or try to give excuses like some other people do, saying that they are not addicted to gambling when the signs are clearly there. Do you think identifying as an addicted gambler will make people stereotype you. The answer is different for every gambler here.
If you are not an addicted gambler I think it is completely understandable that a person will be mad to be categorized in that way, and unfortunately due to the prejudices surrounding gambling there are many people out there that will consider that you are addicted to it even if it is just a hobby for you.
However even addicted gamblers will not like to hear this, as you will be in a way bringing to the surface a very difficult thing for them to accept, so it is natural they are going to be resentful about it as well.