Being nice for no reason

It's been difficult to handle when it's only a few people are going through the same thing and try to get advice from someone that does what they're complaining about when they're not around. Then when you bring it up to a large crowd and tell them how you deal with it by not responding but it's not working out it seems like it becomes a weakness when no one has your back. When this happens to me I just start roasting all of them and I wish they'd have a change of heart when they see I don't teach them a lesson and instead I give them a side to choose from. Is that being nice for no reason or is it just leeway for them 'cause I acknowledge it?