Why exactly do people think bob lazar is lying? What is the evidence?

I actually want to know, i asked this on r/aliens too, all the time i see people saying that bob is a lair and a fraud, and they point to a bunch of shady stuff that he did but I'm yet to see something that debunks what he says, I'm just curious, because i heard something about a brothel, i heard something about his wives, about going to trial, but i still don't think any of that disproves what he is saying, even he is a criminal, criminals still get jobs like that, specially if it's an illegal job as we are now hearing from Grusch that these reverse engeneerings are done outside the oversight of the law. So what exactly is the evidence that debunks Bob Lazar, if there is any?