If you have tendencies to always look for the worst in others, that is all you will see and in turn thinking about the Law of Attraction, that is what you will get more of. In my own personal opionion, this is how most relationships break down. We are always looking for the bad in others as that is how we have been conditioned over our life. And then we spend so much time looking for the bad in someone, we start to think that is all they are made of.
We are all made up of so much more than good or bad. Try to practice looking for things you are grateful for in others. You will be more in the present for starters(as you are trying to catch them doing things you are grateful for) and you will start to see people's positive points and therefore you will get more of that from the people around you.
Why not take it a step further? Keep a record of all that you are grateful for in a 'Gratitude Journal'. You can keep track of people you are grateful for, nature events, people's words, your own thoughts or actions, the list is endless.
Now, when will you write in your gratitude journal?