For years Milwall has had a negative reputation among football fans, with violence and fan intimidation not uncommon. These has lessened in recent years but fans are still advised not to wear away team colors to avoid trouble. The home fans are ultra competitive and supportive of their team.Milwall's reputation is still so much that the Metropolitan Police still send a great deal of officers which can contribute to a negative atmosphere, although it does in fact increase security. The stadium itself doesn't do a lot to take away from this negative vibe with most of the seating and concourses decorated with plain concrete.

The Millwall crowd has a longstanding history of violence and anti-social behaviour, with an established gang (The Millwall Bushwhackers) established to promote and co-ordinate football hooliganism. This means the atmosphere is often very tense, strained and not all that enjoyable. You will never interact with the home fans: you'll be directed to your seats immediately, through a separate entrance and will likely wait a considerably length of time after the game before being siphoned outside. Millwall are trying to improve this reputation, but they're not there yet.