AOC shows little sign of being a crook, at my distance. Likewise Tim Walz, so far. Paul Wellstone was not a crook. Al Franken was not a crook. Lots of elected politicians in my region were and are not crooks. If all your elected politicians are crooks, it's time to take a look at what happened in your elections.
And not all crooks are equivalent - being too lazy and ignorant to evaluate comparative crookedness in ones's politicians hands power to the more crooked, who profit without penalty.
Besides, the sentiment is bullshit - it's a lame excuse for abetting the betrayal of one's neighbors, most recently by voting for (or failing to vote against) the takeover of the Republican Party by fascism. And that's why that particular meme - "both sides" are equivalent in crookedness - was promoted and sold to the suckers of white male America by the propaganda wing of the Republican Party: that betrayal was its agenda.