The former England striker hit out at actress Beverley over her fears that some celebs may play up their battles with depression.
She said this week that stars could flaunt the illness "like a Gucci handbag".
Beverley, who has herself suffered from depression, was backed by Good Morning host Piers Morgan.
He tweeted: "She'll be hammered for saying this but it's 100% true."
But football pundit Collymore, 47, who has also suffered from mental health problems, called on others to ignore the pair.
He wrote: “Don’t bite! Just keep advocating and using your voice to help others.
“Are Callard or Morgan trained MH specialists?
“No, so let them waffle crap and concentrate on what you can do to inform and help others.”
Beverley, 61, has played Liz McDonald in the soap for 30 years.
She is also an ambassador for mental health charity Mind.
She had to take two months off work in 2016 after breaking down in tears on the Corrie set over fears she did not measure up to her younger co-stars.
The actress felt like she was plunging into a “black hole”.
Mind praised Beverley for her openness, saying she had helped save lives by inspiring sufferers to seek help.
But she warned this week there was a danger it could “become fashionable” to claim to suffer from such conditions.
She told Best magazine: “We have to be careful that mental illness doesn’t become like a Gucci handbag.”
Actress Sophie Turner, 22, who plays Sansa Stark in Game Of Thrones, also hit out at the comment this week.
She tweeted that stars “have a platform to speak out about it and help get rid of the stigma of mental illness”.
Sophie added: “Please go ahead and shun them back into silence. T***.’’
But GMB host Piers, 53, replied: “Do you think abusing people helps their mental health, Ms Turner?
Maybe consider that question for your next virtue-signalling Twitter thesis on the subject?’’
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