You're not imagining things. Democrats and Republicans spend a large portion of their time saying negative things about each other. A Harvard professor looked at Congressional press releases and found that 27% of them throw barbs at the other side. Members in safe districts are the worst offenders.
Here's the story in "The Washington Post":
It's the reason we're facing a government shutdown at midnight on Friday. The ideological divide is wide. And Democrats and Republicans talk at each other, not to each other.