I wouldn't say it's gotten better, if anything (from my limited first hand experience) it's been a mixed bag.
What's seems to have improved: I've brought 2 issues to supervisors who didn't get defensive when I encountered front line TSO's who pulled out "Do you want to fly today" when I dared to asked them to change their gloves, or not push my items though the x-ray when I wouldn't be able to pass though the WTMD for a while and didn't want my stuff out of my sight.
What's gotten worse: Since the new uniforms and badges, the chip-on-the-shoulder-LEO-rejects seems to be more willing than ever to try and intimidate. As I mentioned above, I've gotten a raised voice "Do you want to fly today?" twice in my past three trips.