I love you too.
Short answer is nope, not a thing you can do.
You could rip up the carpet and install leaded sound reducing carpet padding. Extremely expensive and won't do jack.
You could rip out their ceiling, and install insulation, but this is only going to take the edge off, vast majority of the bass will still be audible.
You could do both for a slight reduction in sound.
Honestly? Very difficult to reduce sound. Concrete is extremely effective. You need mass, and you just can't accomplish that as an after thought.