The Democrats want to make permanent tax cuts for 99% of tax payers that Republicans voted for 10 years ago and didn't even make permanent themselves. The Democrats want to even lower taxes on the top 1% on their first $250,000 of income.
The Democrats want to make something permanent the Republicans really care about for practically everyone and it's still not good enough. They except the Democrats to cut something that hasn't added 1 penny to the national debt (Social Security) and their refusal to do so makes them unreasonable according to the GOP.
It's really hard to believe if you think about it.