I get that feeling often. I would agree that its more on what you're working on.

If you're having a light-hearted, more self building, session, it's easier to accept them and what they're saying to you.

However, if you're working on something more difficult, like self disclosure or trauma, you're sharing a part of yourself that normally you don't. That's scary and as a defensive, we get angry. It doesn't matter that the person we're angry at is trying to help us - it's more that there's someone who's trying to get in to our secrets, through our inner walls.

One thing I've noticed though is that things get easier and the lines between liking and hating start to come together in a healthy way.