Make my day vs Ruin my day

Do you feel and think the same way when I say that it is a thin line between a moment when someone or something can make or ruin your day completely? Who is to blame? Is this something that changes and becomes worse as we are getting old? Or, maybe some of us are born this way. Meaning, there are some people they can get their day be ruined in a sec just like that. Get a thick skin. Is this the only solution? Or, maybe we need to be careful about the people and situation we get in touch with. What is their capacity to make or ruin our days? Is that the main criterion? Then again, how can you tell that some of your most trusted clients aren't going to move from the make-my-day to the ruin-my-day zone?

Why am I asking these questions in the first place? Well, I guess that I have quite a few ruined days. I would like to reduce them. I believe that's not too much to ask. I am also convinced that's not an unreasonable thing to ask. So, I guess, the first thing to do is to decide who is to blame? Is it all on me? I would like to hear if some of you guys have found some effective methods that work against situations and people that have the capacity for ruining your days. I don't expect to find a magic formula that will allow me to have and enjoy only the perfect days. But again, I just had enough of ruined days. Probably more than I can handle. So, let's hear about the best ways to avoid ruin-my-day scenario. Thx.