I think the first thing you should do is realize that having problems is not a competition. There is always someone who has it worse. There is a starving kid in Africa that everyone likes to tell me about. His problems are apparently much worse than my problems, therefore I no longer have any problems.
Things you perceive as no big deal can still have a tremendous emotional impact on others. We are all built differently and have different capacities to handle stress. Maybe they just want attention, but there is also the possibility that they just can’t handle what they are going through, no matter how insignificant you think it may be.
If they are reaching out to their support system to handle their issues, then you should let them do that. As long as they are not hurting anyone, I don’t see an issue. If I were you, I would focus on yourself and try to work out whatever challenges life has thrown at you. You’ve got more important things to do than leave hateful comments.