I think I would be very insulted if somebody called me any kind of addict, regardless of whether its a gambling addict, drug addict, alcohol or smoking addict. It is understood as an insult to those who are not addicts. Now, if somebody would tell me that I am expressing symptoms of addiction , then that is not something I would get mad at. I would question the person and make a judgement of myself, should the facts all check out.
It is imperative that one understands why one is being associated as an addict. But telling someone to their face or worse, to someone else, that one is an addict, as if it were diagnosed fact, can be wrong and very harming to one's reputation.
Someone will only call you an addict if they have seen too much of what or what you prioritise. This may not sit well with you, but such a scenario can be seen as a wake up call to evaluate yourself to see if you truly fall into that category. As I previously stated, being addicted to something isn't all that bad as long as you're making something positive out of it. However, the ideal approach to use anything is to have control over it, not the other way around; don't allow it rule you; instead, you control it.
Remember that what is worthwhile is worthwhile to achieve well.