I tell them bluntly that only a couple dems have won my vote in the past decade, when they protest I bring up

Police reform (Biden: "fund the police")

Abortion (Obama promised to enshrine it in law, 111th congress dems had a supermajority, did nothing)

Supreme Court seats (at any point when the dems had the majority they could have forced it, instead we have today's bullshit)

Formerly student debt forgiveness (Bidens limp attemps have satisfied most of my lib friends)

Federal Marijuana Legalization (rescheduling Marijuana can be done any day by the president*)

Foreign policy failures (Iraq [Bush but dems supported], Libiya, Syria, Bolivia [Trump but dems supported], Yemen, Cuba)

Drone strikes/Whistleblowers

Capitulation towards republican tax ratcheting

General tendency towards bipartisanship, thereby stopping actual reform (looking at you ACA)