PAUL Roos says he is offended when supporters question his commitment to coaching Melbourne and believes the club is covered in a "veil of negativity".

The 14th-placed Demons suffered a 23-point defeat to Carlton last Sunday after the Blues piled on 10 goals to two in the first half.

Roos said he received a barrage of emails from frustrated club supporters after the loss and was annoyed when people questioned whether he was emotionally invested in the job.

"The things I take offence to in the emails are not about how the team played (but) it's when people say, 'You need to show more commitment'. We [the coaches] think about football 24-7,” Roos told Fox Footy on Monday night.

Have the Demons improved under Roos?

"People that send emails, that's fine, I don't have a problem with it, they go to work … and I know it's hard for them and the bloke comes up and rips (into) them.

"(But) it's actually offensive when people say, 'Does it really hurt?'"

Roos said the spike in emails he received after a loss had given him another perspective about the internal and external perceptions the club had to contend with.

"Another guy emailed me and said, 'I knew driving to the game that we were going to get flogged by Carlton today'," he said.

"And I thought, 'How many players would we have had that thought the same thing?' So these moments actually help you then (think about) what do we do about that (and) how do we address that?"

Although the Demons will be determined to end their season on a high, they travel to Perth this week to face ladder leader Fremantle in what looms as the ultimate test.

Roos acknowledged the "very negative environment" he had witnessed at the club since arriving at the end of 2013.

"I'm learning a lot about the Melbourne Footy Club because I've never been there prior to last year," he said.

"There's no doubt that there's this veil of negativity that exists, and I'm talking about the whole football club, and it's fuelled by everyone."

When asked if he was having trouble "fixing" the Demons, Roos said: "There's some components that are harder than the other.

"I have a great understanding of the club and what needs to be done – that hasn't changed.

"Have we improved? Absolutely. But is the bottom end still terrible? Absolutely."