How to apply meditation in the following difficult situations
Good for you that you're following the path. However, that first year on the path can be a sensitive time as there is a power in meditation. The Buddha talked about this power as being both a way to build your path but also a trap if you dwell in it too long. Meditation is making you more sensitive to the world around you and allowing you to perceive people in a more honest way. As you're seeing, that's not always pretty.  

I would suggest you practice right speech, which is a part of the Eightfold Path. Right speech forces us to be both compassionate to others while also being compassionate to ourselves. We should value ourselves as much as we value someone else. In every conversation -- in every relationship -- everyone should be equals.

The Buddha said that good speech honors the other person while also honoring yourself. If someone does something you don't like, it's not honorable to tear them down with hurtful speech. However, it's also not right to dishonor yourself by saying things you don't believe just to make them feel good. You've got to live your truth while also recognizing theirs and do so in a compassionate way. 

It's a hard balancing act, but if you can do that, you'll find people will change the way they deal with you because you've changed the way you deal with the world.