Walsh said: "When he's saying basically everyone was doing it, he's being so unfair to the people who rode the 1999 Tour de France and tours over the following years clean - and plenty did.
"And he's being so disingenuous because he knows he has travelled to France and met Christophe Bassons, who was one of the guys riding clean. And he has personally apologised to Bassons, whose career was taken away from him.
"Yet he has the gall to say 'we all did it'."
Bassons, who was not implicated in drug-taking, found it difficult to prosper in the world of cycling in the 1990s after speaking out against doping.
The 40-year-old told BBC Radio 5 live: "I think the fact that he says that he doesn't regret it, and that if he went back to the same time, he'd do it again... I think that shows an honesty.
"When I saw him last year, it wasn't the Armstrong that I knew in the '90s any more.
"Back then, he was strong, he was hard, he would stare you in the eyes; he was brutal, he was strong, and he would never make a mistake. But when I saw him last year, he was alone, he was badly dressed, he avoided eye contact - he didn't seem happy."