Generally people would dismiss, criticize and demean others who are trying to improve their own lives by going on a self-development journey. In the the process of becoming better, you need to tolerate the discouraging words and attitude from people who dislike to change for their own good. People who like to be taken care of and who do not like to change their self-limiting beliefs would diss at the people who are making strides to raise their standards.
It could be because of self-serving bias. Some people get inherent satisfaction by degrading people who are doing better than them. By doing so it gives them an instant relief from their own demons and weakness. Instead of working on themselves, it is much easier to be dismissive of other’s hard work. Instead of being supportive and encouraging others (especially loved ones) when they are trying hard to get better, the other half would get in the way by saying things that would make them feel guilty.
Reasons for displaying this kind of attitude could be many. May be people feel threatened by unfamiliar behaviour of their loved ones even though it is positive and healthy, may be because it would remind themselves of their failures, it might remind themselves of the situations where they gave up on themselves, our close people may feel that they might lose you
Most importantly you must remember that it is very easy to discourage, demotivate, demoralize, drag somebody down then to work on oneself to reach higher standards.
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